DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (f2644bf19c9f)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * JS date methods.
 *
 * "For example, OS/360 devotes 26 bytes of the permanently
 *  resident date-turnover routine to the proper handling of
 *  December 31 on leap years (when it is Day 366).  That
 *  might have been left to the operator."
 *
 * Frederick Brooks, 'The Second-System Effect'.
 */

#include "jsdate.h"

#include "mozilla/ArrayUtils.h"
#include "mozilla/Atomics.h"
#include "mozilla/Casting.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Sprintf.h"
#include "mozilla/TextUtils.h"

#include <math.h>
#include <string.h>

#include "jsapi.h"
#include "jsfriendapi.h"
#include "jsnum.h"
#include "jstypes.h"
#include "jsutil.h"

#include "js/Conversions.h"
#include "js/Date.h"
#include "js/LocaleSensitive.h"
#include "js/PropertySpec.h"
#include "js/Wrapper.h"
#include "util/StringBuffer.h"
#include "util/Text.h"
#include "vm/DateObject.h"
#include "vm/DateTime.h"
#include "vm/GlobalObject.h"
#include "vm/Interpreter.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/StringType.h"
#include "vm/Time.h"

#include "vm/JSObject-inl.h"

using namespace js;

using mozilla::ArrayLength;
using mozilla::Atomic;
using mozilla::BitwiseCast;
using mozilla::IsAsciiAlpha;
using mozilla::IsAsciiDigit;
using mozilla::IsFinite;
using mozilla::IsNaN;
using mozilla::NumbersAreIdentical;
using mozilla::Relaxed;

using JS::AutoCheckCannotGC;
using JS::ClippedTime;
using JS::GenericNaN;
using JS::TimeClip;
using JS::ToInteger;

// When this value is non-zero, we'll round the time by this resolution.
static Atomic<uint32_t, Relaxed> sResolutionUsec;
// This is not implemented yet, but we will use this to know to jitter the time
// in the JS shell
static Atomic<bool, Relaxed> sJitter;
// The callback we will use for the Gecko implementation of Timer
// Clamping/Jittering
static Atomic<JS::ReduceMicrosecondTimePrecisionCallback, Relaxed>
    sReduceMicrosecondTimePrecisionCallback;

/*
 * The JS 'Date' object is patterned after the Java 'Date' object.
 * Here is a script:
 *
 *    today = new Date();
 *
 *    print(today.toLocaleString());
 *
 *    weekDay = today.getDay();
 *
 *
 * These Java (and ECMA-262) methods are supported:
 *
 *     UTC
 *     getDate (getUTCDate)
 *     getDay (getUTCDay)
 *     getHours (getUTCHours)
 *     getMinutes (getUTCMinutes)
 *     getMonth (getUTCMonth)
 *     getSeconds (getUTCSeconds)
 *     getMilliseconds (getUTCMilliseconds)
 *     getTime
 *     getTimezoneOffset
 *     getYear
 *     getFullYear (getUTCFullYear)
 *     parse
 *     setDate (setUTCDate)
 *     setHours (setUTCHours)
 *     setMinutes (setUTCMinutes)
 *     setMonth (setUTCMonth)
 *     setSeconds (setUTCSeconds)
 *     setMilliseconds (setUTCMilliseconds)
 *     setTime
 *     setYear (setFullYear, setUTCFullYear)
 *     toGMTString (toUTCString)
 *     toLocaleString
 *     toString
 *
 *
 * These Java methods are not supported
 *
 *     setDay
 *     before
 *     after
 *     equals
 *     hashCode
 */

namespace {

class DateTimeHelper {
 private:
#if ENABLE_INTL_API && !MOZ_SYSTEM_ICU
  static double localTZA(double t, DateTimeInfo::TimeZoneOffset offset);
#else
  static int equivalentYearForDST(int year);
  static bool isRepresentableAsTime32(double t);
  static double daylightSavingTA(double t);
  static double adjustTime(double date);
  static PRMJTime toPRMJTime(double localTime, double utcTime);
#endif

 public:
  static double localTime(double t);
  static double UTC(double t);
  static JSString* timeZoneComment(JSContext* cx, double utcTime,
                                   double localTime);
#if !ENABLE_INTL_API || MOZ_SYSTEM_ICU
  static size_t formatTime(char* buf, size_t buflen, const char* fmt,
                           double utcTime, double localTime);
#endif
};

}  // namespace

// ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557
// 5.2.5 Mathematical Operations
static inline double PositiveModulo(double dividend, double divisor) {
  MOZ_ASSERT(divisor > 0);
  MOZ_ASSERT(IsFinite(divisor));

  double result = fmod(dividend, divisor);
  if (result < 0) {
    result += divisor;
  }
  return result + (+0.0);
}

static inline double Day(double t) { return floor(t / msPerDay); }

static double TimeWithinDay(double t) { return PositiveModulo(t, msPerDay); }

/* ES5 15.9.1.3. */
static inline bool IsLeapYear(double year) {
  MOZ_ASSERT(ToInteger(year) == year);
  return fmod(year, 4) == 0 && (fmod(year, 100) != 0 || fmod(year, 400) == 0);
}

static inline double DaysInYear(double year) {
  if (!IsFinite(year)) {
    return GenericNaN();
  }
  return IsLeapYear(year) ? 366 : 365;
}

static inline double DayFromYear(double y) {
  return 365 * (y - 1970) + floor((y - 1969) / 4.0) -
         floor((y - 1901) / 100.0) + floor((y - 1601) / 400.0);
}

static inline double TimeFromYear(double y) {
  return DayFromYear(y) * msPerDay;
}

static double YearFromTime(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  MOZ_ASSERT(ToInteger(t) == t);

  double y = floor(t / (msPerDay * 365.2425)) + 1970;
  double t2 = TimeFromYear(y);

  /*
   * Adjust the year if the approximation was wrong.  Since the year was
   * computed using the average number of ms per year, it will usually
   * be wrong for dates within several hours of a year transition.
   */
  if (t2 > t) {
    y--;
  } else {
    if (t2 + msPerDay * DaysInYear(y) <= t) {
      y++;
    }
  }
  return y;
}

static inline int DaysInFebruary(double year) {
  return IsLeapYear(year) ? 29 : 28;
}

/* ES5 15.9.1.4. */
static inline double DayWithinYear(double t, double year) {
  MOZ_ASSERT_IF(IsFinite(t), YearFromTime(t) == year);
  return Day(t) - DayFromYear(year);
}

static double MonthFromTime(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  double year = YearFromTime(t);
  double d = DayWithinYear(t, year);

  int step;
  if (d < (step = 31)) {
    return 0;
  }
  if (d < (step += DaysInFebruary(year))) {
    return 1;
  }
  if (d < (step += 31)) {
    return 2;
  }
  if (d < (step += 30)) {
    return 3;
  }
  if (d < (step += 31)) {
    return 4;
  }
  if (d < (step += 30)) {
    return 5;
  }
  if (d < (step += 31)) {
    return 6;
  }
  if (d < (step += 31)) {
    return 7;
  }
  if (d < (step += 30)) {
    return 8;
  }
  if (d < (step += 31)) {
    return 9;
  }
  if (d < (step += 30)) {
    return 10;
  }
  return 11;
}

/* ES5 15.9.1.5. */
static double DateFromTime(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  double year = YearFromTime(t);
  double d = DayWithinYear(t, year);

  int next;
  if (d <= (next = 30)) {
    return d + 1;
  }
  int step = next;
  if (d <= (next += DaysInFebruary(year))) {
    return d - step;
  }
  step = next;
  if (d <= (next += 31)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 30)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 31)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 30)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 31)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 31)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 30)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 31)) {
    return d - step;
  }
  step = next;
  if (d <= (next += 30)) {
    return d - step;
  }
  step = next;
  return d - step;
}

/* ES5 15.9.1.6. */
static int WeekDay(double t) {
  /*
   * We can't assert TimeClip(t) == t because we call this function with
   * local times, which can be offset outside TimeClip's permitted range.
   */
  MOZ_ASSERT(ToInteger(t) == t);
  int result = (int(Day(t)) + 4) % 7;
  if (result < 0) {
    result += 7;
  }
  return result;
}

static inline int DayFromMonth(int month, bool isLeapYear) {
  /*
   * The following array contains the day of year for the first day of
   * each month, where index 0 is January, and day 0 is January 1.
   */
  static const int firstDayOfMonth[2][13] = {
      {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
      {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}};

  MOZ_ASSERT(0 <= month && month <= 12);
  return firstDayOfMonth[isLeapYear][month];
}

template <typename T>
static inline int DayFromMonth(T month, bool isLeapYear) = delete;

/* ES5 15.9.1.12 (out of order to accommodate DaylightSavingTA). */
static double MakeDay(double year, double month, double date) {
  /* Step 1. */
  if (!IsFinite(year) || !IsFinite(month) || !IsFinite(date)) {
    return GenericNaN();
  }

  /* Steps 2-4. */
  double y = ToInteger(year);
  double m = ToInteger(month);
  double dt = ToInteger(date);

  /* Step 5. */
  double ym = y + floor(m / 12);

  /* Step 6. */
  int mn = int(PositiveModulo(m, 12));

  /* Steps 7-8. */
  bool leap = IsLeapYear(ym);

  double yearday = floor(TimeFromYear(ym) / msPerDay);
  double monthday = DayFromMonth(mn, leap);

  return yearday + monthday + dt - 1;
}

/* ES5 15.9.1.13 (out of order to accommodate DaylightSavingTA). */
static inline double MakeDate(double day, double time) {
  /* Step 1. */
  if (!IsFinite(day) || !IsFinite(time)) {
    return GenericNaN();
  }

  /* Step 2. */
  return day * msPerDay + time;
}

JS_PUBLIC_API double JS::MakeDate(double year, unsigned month, unsigned day) {
  MOZ_ASSERT(month <= 11);
  MOZ_ASSERT(day >= 1 && day <= 31);

  return ::MakeDate(MakeDay(year, month, day), 0);
}

JS_PUBLIC_API double JS::MakeDate(double year, unsigned month, unsigned day,
                                  double time) {
  MOZ_ASSERT(month <= 11);
  MOZ_ASSERT(day >= 1 && day <= 31);

  return ::MakeDate(MakeDay(year, month, day), time);
}

JS_PUBLIC_API double JS::YearFromTime(double time) {
  return ::YearFromTime(time);
}

JS_PUBLIC_API double JS::MonthFromTime(double time) {
  return ::MonthFromTime(time);
}

JS_PUBLIC_API double JS::DayFromTime(double time) { return DateFromTime(time); }

JS_PUBLIC_API double JS::DayFromYear(double year) {
  return ::DayFromYear(year);
}

JS_PUBLIC_API double JS::DayWithinYear(double time, double year) {
  return ::DayWithinYear(time, year);
}

JS_PUBLIC_API void JS::SetReduceMicrosecondTimePrecisionCallback(
    JS::ReduceMicrosecondTimePrecisionCallback callback) {
  sReduceMicrosecondTimePrecisionCallback = callback;
}

JS_PUBLIC_API void JS::SetTimeResolutionUsec(uint32_t resolution, bool jitter) {
  sResolutionUsec = resolution;
  sJitter = jitter;
}

#if ENABLE_INTL_API && !MOZ_SYSTEM_ICU
// ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557
// 20.3.1.7 LocalTZA ( t, isUTC )
double DateTimeHelper::localTZA(double t, DateTimeInfo::TimeZoneOffset offset) {
  MOZ_ASSERT(IsFinite(t));

  int64_t milliseconds = static_cast<int64_t>(t);
  int32_t offsetMilliseconds =
      DateTimeInfo::getOffsetMilliseconds(milliseconds, offset);
  return static_cast<double>(offsetMilliseconds);
}

// ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557
// 20.3.1.8 LocalTime ( t )
double DateTimeHelper::localTime(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  MOZ_ASSERT(StartOfTime <= t && t <= EndOfTime);
  return t + localTZA(t, DateTimeInfo::TimeZoneOffset::UTC);
}

// ES2019 draft rev 0ceb728a1adbffe42b26972a6541fd7f398b1557
// 20.3.1.9 UTC ( t )
double DateTimeHelper::UTC(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  if (t < (StartOfTime - msPerDay) || t > (EndOfTime + msPerDay)) {
    return GenericNaN();
  }

  return t - localTZA(t, DateTimeInfo::TimeZoneOffset::Local);
}
#else
/*
 * Find a year for which any given date will fall on the same weekday.
 *
 * This function should be used with caution when used other than
 * for determining DST; it hasn't been proven not to produce an
 * incorrect year for times near year boundaries.
 */
int DateTimeHelper::equivalentYearForDST(int year) {
  /*
   * Years and leap years on which Jan 1 is a Sunday, Monday, etc.
   *
   * yearStartingWith[0][i] is an example non-leap year where
   * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
   *
   * yearStartingWith[1][i] is an example leap year where
   * Jan 1 appears on Sunday (i == 0), Monday (i == 1), etc.
   *
   * Keep two different mappings, one for past years (< 1970), and a
   * different one for future years (> 2037).
   */
  static const int pastYearStartingWith[2][7] = {
      {1978, 1973, 1974, 1975, 1981, 1971, 1977},
      {1984, 1996, 1980, 1992, 1976, 1988, 1972}};
  static const int futureYearStartingWith[2][7] = {
      {2034, 2035, 2030, 2031, 2037, 2027, 2033},
      {2012, 2024, 2036, 2020, 2032, 2016, 2028}};

  int day = int(DayFromYear(year) + 4) % 7;
  if (day < 0) {
    day += 7;
  }

  const auto& yearStartingWith =
      year < 1970 ? pastYearStartingWith : futureYearStartingWith;
  return yearStartingWith[IsLeapYear(year)][day];
}

// Return true if |t| is representable as a 32-bit time_t variable, that means
// the year is in [1970, 2038).
bool DateTimeHelper::isRepresentableAsTime32(double t) {
  return 0.0 <= t && t < 2145916800000.0;
}

/* ES5 15.9.1.8. */
double DateTimeHelper::daylightSavingTA(double t) {
  if (!IsFinite(t)) {
    return GenericNaN();
  }

  /*
   * If earlier than 1970 or after 2038, potentially beyond the ken of
   * many OSes, map it to an equivalent year before asking.
   */
  if (!isRepresentableAsTime32(t)) {
    int year = equivalentYearForDST(int(YearFromTime(t)));
    double day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
    t = MakeDate(day, TimeWithinDay(t));
  }

  int64_t utcMilliseconds = static_cast<int64_t>(t);
  int32_t offsetMilliseconds =
      DateTimeInfo::getDSTOffsetMilliseconds(utcMilliseconds);
  return static_cast<double>(offsetMilliseconds);
}

double DateTimeHelper::adjustTime(double date) {
  double localTZA = DateTimeInfo::localTZA();
  double t = daylightSavingTA(date) + localTZA;
  t = (localTZA >= 0) ? fmod(t, msPerDay) : -fmod(msPerDay - t, msPerDay);
  return t;
}

/* ES5 15.9.1.9. */
double DateTimeHelper::localTime(double t) { return t + adjustTime(t); }

double DateTimeHelper::UTC(double t) {
  // Following the ES2017 specification creates undesirable results at DST
  // transitions. For example when transitioning from PST to PDT,
  // |new Date(2016,2,13,2,0,0).toTimeString()| returns the string value
  // "01:00:00 GMT-0800 (PST)" instead of "03:00:00 GMT-0700 (PDT)". Follow
  // V8 and subtract one hour before computing the offset.
  // Spec bug: https://bugs.ecmascript.org/show_bug.cgi?id=4007

  return t - adjustTime(t - DateTimeInfo::localTZA() - msPerHour);
}
#endif /* ENABLE_INTL_API && !MOZ_SYSTEM_ICU */

static double LocalTime(double t) { return DateTimeHelper::localTime(t); }

static double UTC(double t) { return DateTimeHelper::UTC(t); }

/* ES5 15.9.1.10. */
static double HourFromTime(double t) {
  return PositiveModulo(floor(t / msPerHour), HoursPerDay);
}

static double MinFromTime(double t) {
  return PositiveModulo(floor(t / msPerMinute), MinutesPerHour);
}

static double SecFromTime(double t) {
  return PositiveModulo(floor(t / msPerSecond), SecondsPerMinute);
}

static double msFromTime(double t) { return PositiveModulo(t, msPerSecond); }

/* ES5 15.9.1.11. */
static double MakeTime(double hour, double min, double sec, double ms) {
  /* Step 1. */
  if (!IsFinite(hour) || !IsFinite(min) || !IsFinite(sec) || !IsFinite(ms)) {
    return GenericNaN();
  }

  /* Step 2. */
  double h = ToInteger(hour);

  /* Step 3. */
  double m = ToInteger(min);

  /* Step 4. */
  double s = ToInteger(sec);

  /* Step 5. */
  double milli = ToInteger(ms);

  /* Steps 6-7. */
  return h * msPerHour + m * msPerMinute + s * msPerSecond + milli;
}

/**
 * end of ECMA 'support' functions
 */

/* for use by date_parse */

static const char* const wtb[] = {
    // clang-format off
    "am", "pm",
    "monday", "tuesday", "wednesday", "thursday", "friday",
    "saturday", "sunday",
    "january", "february", "march", "april", "may", "june",
    "july", "august", "september", "october", "november", "december",
    "gmt", "ut", "utc",
    "est", "edt",
    "cst", "cdt",
    "mst", "mdt",
    "pst", "pdt"
    /* time zone table needs to be expanded */
    // clang-format on
};

static const int ttb[] = {
    // clang-format off
    -1, -2, 0, 0, 0, 0, 0, 0, 0,       /* AM/PM */
    2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
    10000 + 0, 10000 + 0, 10000 + 0,   /* GMT/UT/UTC */
    10000 + 5 * 60, 10000 + 4 * 60,    /* EST/EDT */
    10000 + 6 * 60, 10000 + 5 * 60,    /* CST/CDT */
    10000 + 7 * 60, 10000 + 6 * 60,    /* MST/MDT */
    10000 + 8 * 60, 10000 + 7 * 60     /* PST/PDT */
    // clang-format on
};

template <typename CharT>
static bool RegionMatches(const char* s1, int s1off, const CharT* s2, int s2off,
                          int count) {
  while (count > 0 && s1[s1off] && s2[s2off]) {
    if (unicode::ToLowerCase(s1[s1off]) != unicode::ToLowerCase(s2[s2off])) {
      break;
    }

    s1off++;
    s2off++;
    count--;
  }

  return count == 0;
}

// ES2017 draft rev (TODO: Add git hash when PR 642 is merged.)
// 20.3.3.4
// Date.UTC(year [, month [, date [, hours [, minutes [, seconds [, ms]]]]]])
static bool date_UTC(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  double y;
  if (!ToNumber(cx, args.get(0), &y)) {
    return false;
  }

  // Step 2.
  double m;
  if (args.length() >= 2) {
    if (!ToNumber(cx, args[1], &m)) {
      return false;
    }
  } else {
    m = 0;
  }

  // Step 3.
  double dt;
  if (args.length() >= 3) {
    if (!ToNumber(cx, args[2], &dt)) {
      return false;
    }
  } else {
    dt = 1;
  }

  // Step 4.
  double h;
  if (args.length() >= 4) {
    if (!ToNumber(cx, args[3], &h)) {
      return false;
    }
  } else {
    h = 0;
  }

  // Step 5.
  double min;
  if (args.length() >= 5) {
    if (!ToNumber(cx, args[4], &min)) {
      return false;
    }
  } else {
    min = 0;
  }

  // Step 6.
  double s;
  if (args.length() >= 6) {
    if (!ToNumber(cx, args[5], &s)) {
      return false;
    }
  } else {
    s = 0;
  }

  // Step 7.
  double milli;
  if (args.length() >= 7) {
    if (!ToNumber(cx, args[6], &milli)) {
      return false;
    }
  } else {
    milli = 0;
  }

  // Step 8.
  double yr = y;
  if (!IsNaN(y)) {
    double yint = ToInteger(y);
    if (0 <= yint && yint <= 99) {
      yr = 1900 + yint;
    }
  }

  // Step 9.
  ClippedTime time =
      TimeClip(MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli)));
  args.rval().set(TimeValue(time));
  return true;
}

/*
 * Read and convert decimal digits from s[*i] into *result
 * while *i < limit.
 *
 * Succeed if any digits are converted. Advance *i only
 * as digits are consumed.
 */
template <typename CharT>
static bool ParseDigits(size_t* result, const CharT* s, size_t* i,
                        size_t limit) {
  size_t init = *i;
  *result = 0;
  while (*i < limit && ('0' <= s[*i] && s[*i] <= '9')) {
    *result *= 10;
    *result += (s[*i] - '0');
    ++(*i);
  }
  return *i != init;
}

/*
 * Read and convert decimal digits to the right of a decimal point,
 * representing a fractional integer, from s[*i] into *result
 * while *i < limit.
 *
 * Succeed if any digits are converted. Advance *i only
 * as digits are consumed.
 */
template <typename CharT>
static bool ParseFractional(double* result, const CharT* s, size_t* i,
                            size_t limit) {
  double factor = 0.1;
  size_t init = *i;
  *result = 0.0;
  while (*i < limit && ('0' <= s[*i] && s[*i] <= '9')) {
    *result += (s[*i] - '0') * factor;
    factor *= 0.1;
    ++(*i);
  }
  return *i != init;
}

/*
 * Read and convert exactly n decimal digits from s[*i]
 * to s[min(*i+n,limit)] into *result.
 *
 * Succeed if exactly n digits are converted. Advance *i only
 * on success.
 */
template <typename CharT>
static bool ParseDigitsN(size_t n, size_t* result, const CharT* s, size_t* i,
                         size_t limit) {
  size_t init = *i;

  if (ParseDigits(result, s, i, Min(limit, init + n))) {
    return (*i - init) == n;
  }

  *i = init;
  return false;
}

/*
 * Read and convert n or less decimal digits from s[*i]
 * to s[min(*i+n,limit)] into *result.
 *
 * Succeed only if greater than zero but less than or equal to n digits are
 * converted. Advance *i only on success.
 */
template <typename CharT>
static bool ParseDigitsNOrLess(size_t n, size_t* result, const CharT* s,
                               size_t* i, size_t limit) {
  size_t init = *i;

  if (ParseDigits(result, s, i, Min(limit, init + n))) {
    return ((*i - init) > 0) && ((*i - init) <= n);
  }

  *i = init;
  return false;
}

static int DaysInMonth(int year, int month) {
  bool leap = IsLeapYear(year);
  int result = int(DayFromMonth(month, leap) - DayFromMonth(month - 1, leap));
  return result;
}

/*
 * Parse a string according to the formats specified in section 20.3.1.16
 * of the ECMAScript standard. These formats are based upon a simplification
 * of the ISO 8601 Extended Format. As per the spec omitted month and day
 * values are defaulted to '01', omitted HH:mm:ss values are defaulted to '00'
 * and an omitted sss field is defaulted to '000'.
 *
 * For cross compatibility we allow the following extensions.
 *
 * These are:
 *
 *   Standalone time part:
 *     Any of the time formats below can be parsed without a date part.
 *     E.g. "T19:00:00Z" will parse successfully. The date part will then
 *     default to 1970-01-01.
 *
 *   'T' from the time part may be replaced with a space character:
 *     "1970-01-01 12:00:00Z" will parse successfully. Note that only a single
 *     space is permitted and this is not permitted in the standalone
 *     version above.
 *
 *   One or more decimal digits for milliseconds:
 *     The specification requires exactly three decimal digits for
 *     the fractional part but we allow for one or more digits.
 *
 *   Time zone specifier without ':':
 *     We allow the time zone to be specified without a ':' character.
 *     E.g. "T19:00:00+0700" is equivalent to "T19:00:00+07:00".
 *
 *   One or two digits for months, days, hours, minutes and seconds:
 *     The specification requires exactly two decimal digits for the fields
 *     above. We allow for one or two decimal digits. I.e. "1970-1-1" is
 *     equivalent to "1970-01-01".
 *
 * Date part:
 *
 *  Year:
 *     YYYY (eg 1997)
 *
 *  Year and month:
 *     YYYY-MM (eg 1997-07)
 *
 *  Complete date:
 *     YYYY-MM-DD (eg 1997-07-16)
 *
 * Time part:
 *
 *  Hours and minutes:
 *     Thh:mmTZD (eg T19:20+01:00)
 *
 *  Hours, minutes and seconds:
 *     Thh:mm:ssTZD (eg T19:20:30+01:00)
 *
 *  Hours, minutes, seconds and a decimal fraction of a second:
 *     Thh:mm:ss.sTZD (eg T19:20:30.45+01:00)
 *
 * where:
 *
 *   YYYY = four-digit year or six digit year as +YYYYYY or -YYYYYY
 *   MM   = one or two-digit month (01=January, etc.)
 *   DD   = one or two-digit day of month (01 through 31)
 *   hh   = one or two digits of hour (00 through 23) (am/pm NOT allowed)
 *   mm   = one or two digits of minute (00 through 59)
 *   ss   = one or two digits of second (00 through 59)
 *   sss  = one or more digits representing a decimal fraction of a second
 *   TZD  = time zone designator (Z or +hh:mm or -hh:mm or missing for local)
 */
template <typename CharT>
static bool ParseISOStyleDate(const CharT* s, size_t length,
                              ClippedTime* result) {
  size_t i = 0;
  size_t pre = 0;
  int tzMul = 1;
  int dateMul = 1;
  size_t year = 1970;
  size_t month = 1;
  size_t day = 1;
  size_t hour = 0;
  size_t min = 0;
  size_t sec = 0;
  double frac = 0;
  bool isLocalTime = false;
  size_t tzHour = 0;
  size_t tzMin = 0;
  bool isPermissive = false;
  bool isStrict = false;

#define PEEK(ch) (i < length && s[i] == ch)

#define NEED(ch)                   \
  if (i >= length || s[i] != ch) { \
    return false;                  \
  } else {                         \
    ++i;                           \
  }

#define DONE_DATE_UNLESS(ch)       \
  if (i >= length || s[i] != ch) { \
    goto done_date;                \
  } else {                         \
    ++i;                           \
  }

#define DONE_UNLESS(ch)            \
  if (i >= length || s[i] != ch) { \
    goto done;                     \
  } else {                         \
    ++i;                           \
  }

#define NEED_NDIGITS(n, field)                   \
  if (!ParseDigitsN(n, &field, s, &i, length)) { \
    return false;                                \
  }

#define NEED_NDIGITS_OR_LESS(n, field)                 \
  pre = i;                                             \
  if (!ParseDigitsNOrLess(n, &field, s, &i, length)) { \
    return false;                                      \
  }                                                    \
  if (i < pre + (n)) {                                 \
    if (isStrict) {                                    \
      return false;                                    \
    } else {                                           \
      isPermissive = true;                             \
    }                                                  \
  }

  if (PEEK('+') || PEEK('-')) {
    if (PEEK('-')) {
      dateMul = -1;
    }
    ++i;
    NEED_NDIGITS(6, year);
  } else {
    NEED_NDIGITS(4, year);
  }
  DONE_DATE_UNLESS('-');
  NEED_NDIGITS_OR_LESS(2, month);
  DONE_DATE_UNLESS('-');
  NEED_NDIGITS_OR_LESS(2, day);

done_date:
  if (PEEK('T')) {
    if (isPermissive) {
      // Require standard format "[+00]1970-01-01" if a time part marker "T"
      // exists
      return false;
    }
    isStrict = true;
    i++;
  } else if (PEEK(' ')) {
    i++;
  } else {
    goto done;
  }

  NEED_NDIGITS_OR_LESS(2, hour);
  NEED(':');
  NEED_NDIGITS_OR_LESS(2, min);

  if (PEEK(':')) {
    ++i;
    NEED_NDIGITS_OR_LESS(2, sec);
    if (PEEK('.')) {
      ++i;
      if (!ParseFractional(&frac, s, &i, length)) {
        return false;
      }
    }
  }

  if (PEEK('Z')) {
    ++i;
  } else if (PEEK('+') || PEEK('-')) {
    if (PEEK('-')) {
      tzMul = -1;
    }
    ++i;
    NEED_NDIGITS(2, tzHour);
    /*
     * Non-standard extension to the ISO date format (permitted by ES5):
     * allow "-0700" as a time zone offset, not just "-07:00".
     */
    if (PEEK(':')) {
      ++i;
    }
    NEED_NDIGITS(2, tzMin);
  } else {
    isLocalTime = true;
  }

done:
  if (year > 275943  // ceil(1e8/365) + 1970
      || (month == 0 || month > 12) ||
      (day == 0 || day > size_t(DaysInMonth(year, month))) || hour > 24 ||
      ((hour == 24) && (min > 0 || sec > 0 || frac > 0)) || min > 59 ||
      sec > 59 || tzHour > 23 || tzMin > 59) {
    return false;
  }

  if (i != length) {
    return false;
  }

  month -= 1; /* convert month to 0-based */

  double msec = MakeDate(MakeDay(dateMul * double(year), month, day),
                         MakeTime(hour, min, sec, frac * 1000.0));

  if (isLocalTime) {
    msec = UTC(msec);
  } else {
    msec -= tzMul * (tzHour * msPerHour + tzMin * msPerMinute);
  }

  *result = TimeClip(msec);
  return NumbersAreIdentical(msec, result->toDouble());

#undef PEEK
#undef NEED
#undef DONE_UNLESS
#undef NEED_NDIGITS
#undef NEED_NDIGITS_OR_LESS
}

template <typename CharT>
static bool ParseDate(const CharT* s, size_t length, ClippedTime* result) {
  if (ParseISOStyleDate(s, length, result)) {
    return true;
  }

  if (length == 0) {
    return false;
  }

  int year = -1;
  int mon = -1;
  int mday = -1;
  int hour = -1;
  int min = -1;
  int sec = -1;
  int tzOffset = -1;

  // One of '+', '-', ':', '/', or 0 (the default value).
  int prevc = 0;

  bool seenPlusMinus = false;
  bool seenMonthName = false;
  bool seenFullYear = false;
  bool negativeYear = false;

  size_t i = 0;
  while (i < length) {
    int c = s[i];
    i++;
    if (c <= ' ' || c == ',' || c == '-') {
      if (c == '-' && '0' <= s[i] && s[i] <= '9') {
        prevc = c;
      }
      continue;
    }
    if (c == '(') { /* comments) */
      int depth = 1;
      while (i < length) {
        c = s[i];
        i++;
        if (c == '(') {
          depth++;
        } else if (c == ')') {
          if (--depth <= 0) {
            break;
          }
        }
      }
      continue;
    }
    if ('0' <= c && c <= '9') {
      size_t partStart = i - 1;
      uint32_t u = c - '0';
      while (i < length && '0' <= (c = s[i]) && c <= '9') {
        u = u * 10 + (c - '0');
        i++;
      }
      size_t partLength = i - partStart;

      int n = int(u);

      /*
       * Allow TZA before the year, so 'Wed Nov 05 21:49:11 GMT-0800 1997'
       * works.
       *
       * Uses of seenPlusMinus allow ':' in TZA, so Java no-timezone style
       * of GMT+4:30 works.
       */

      if (prevc == '-' && (tzOffset != 0 || seenPlusMinus) && partLength >= 4 &&
          year < 0) {
        // Parse as a negative, possibly zero-padded year if
        // 1. the preceding character is '-',
        // 2. the TZA is not 'GMT' (tested by |tzOffset != 0|),
        // 3. or a TZA was already parsed |seenPlusMinus == true|,
        // 4. the part length is at least 4 (to parse '-08' as a TZA),
        // 5. and we did not already parse a year |year < 0|.
        year = n;
        seenFullYear = true;
        negativeYear = true;
      } else if ((prevc == '+' || prevc == '-') /*  && year>=0 */) {
        /* Make ':' case below change tzOffset. */
        seenPlusMinus = true;

        /* offset */
        if (n < 24) {
          n = n * 60; /* EG. "GMT-3" */
        } else {
          n = n % 100 + n / 100 * 60; /* eg "GMT-0430" */
        }

        if (prevc == '+') /* plus means east of GMT */
          n = -n;

        // Reject if not preceded by 'GMT' or if a time zone offset
        // was already parsed.
        if (tzOffset != 0 && tzOffset != -1) {
          return false;
        }

        tzOffset = n;
      } else if (prevc == '/' && mon >= 0 && mday >= 0 && year < 0) {
        if (c <= ' ' || c == ',' || c == '/' || i >= length) {
          year = n;
        } else {
          return false;
        }
      } else if (c == ':') {
        if (hour < 0) {
          hour = /*byte*/ n;
        } else if (min < 0) {
          min = /*byte*/ n;
        } else {
          return false;
        }
      } else if (c == '/') {
        /*
         * Until it is determined that mon is the actual month, keep
         * it as 1-based rather than 0-based.
         */
        if (mon < 0) {
          mon = /*byte*/ n;
        } else if (mday < 0) {
          mday = /*byte*/ n;
        } else {
          return false;
        }
      } else if (i < length && c != ',' && c > ' ' && c != '-' && c != '(') {
        return false;
      } else if (seenPlusMinus && n < 60) { /* handle GMT-3:30 */
        if (tzOffset < 0) {
          tzOffset -= n;
        } else {
          tzOffset += n;
        }
      } else if (hour >= 0 && min < 0) {
        min = /*byte*/ n;
      } else if (prevc == ':' && min >= 0 && sec < 0) {
        sec = /*byte*/ n;
      } else if (mon < 0) {
        mon = /*byte*/ n;
      } else if (mon >= 0 && mday < 0) {
        mday = /*byte*/ n;
      } else if (mon >= 0 && mday >= 0 && year < 0) {
        year = n;
        seenFullYear = partLength >= 4;
      } else {
        return false;
      }
      prevc = 0;
    } else if (c == '/' || c == ':' || c == '+' || c == '-') {
      prevc = c;
    } else {
      size_t st = i - 1;
      while (i < length) {
        c = s[i];
        if (!IsAsciiAlpha(c)) {
          break;
        }
        i++;
      }

      if (i <= st + 1) {
        return false;
      }

      int k;
      for (k = ArrayLength(wtb); --k >= 0;) {
        if (RegionMatches(wtb[k], 0, s, st, i - st)) {
          int action = ttb[k];
          if (action != 0) {
            if (action < 0) {
              /*
               * AM/PM. Count 12:30 AM as 00:30, 12:30 PM as
               * 12:30, instead of blindly adding 12 if PM.
               */
              MOZ_ASSERT(action == -1 || action == -2);
              if (hour > 12 || hour < 0) {
                return false;
              }

              if (action == -1 && hour == 12) /* am */
                hour = 0;
              else if (action == -2 && hour != 12) /* pm */
                hour += 12;
            } else if (action <= 13) { /* month! */
              /*
               * Adjust mon to be 1-based until the final values
               * for mon, mday and year are adjusted below.
               */
              if (seenMonthName) {
                return false;
              }

              seenMonthName = true;
              int temp = /*byte*/ (action - 2) + 1;

              if (mon < 0) {
                mon = temp;
              } else if (mday < 0) {
                mday = mon;
                mon = temp;
              } else if (year < 0) {
                year = mon;
                mon = temp;
              } else {
                return false;
              }
            } else {
              tzOffset = action - 10000;
            }
          }
          break;
        }
      }

      if (k < 0) {
        return false;
      }

      prevc = 0;
    }
  }

  if (year < 0 || mon < 0 || mday < 0) {
    return false;
  }

  /*
   * Case 1. The input string contains an English month name.
   *         The form of the string can be month f l, or f month l, or
   *         f l month which each evaluate to the same date.
   *         If f and l are both greater than or equal to 100 the date
   *         is invalid.
   *
   *         The year is taken to be either the greater of the values f, l or
   *         whichever is set to zero.
   *
   * Case 2. The input string is of the form "f/m/l" where f, m and l are
   *         integers, e.g. 7/16/45. mon, mday and year values are adjusted
   *         to achieve Chrome compatibility.
   *
   *         a. If 0 < f <= 12 and 0 < l <= 31, f/m/l is interpreted as
   *         month/day/year.
   *         b. If 31 < f and 0 < m <= 12 and 0 < l <= 31 f/m/l is
   *         interpreted as year/month/day
   */
  if (seenMonthName) {
    if (mday >= 100 && mon >= 100) {
      return false;
    }

    if (year > 0 && (mday == 0 || mday > year) && !seenFullYear) {
      int temp = year;
      year = mday;
      mday = temp;
    }

    if (mday <= 0 || mday > 31) {
      return false;
    }

  } else if (0 < mon && mon <= 12 && 0 < mday && mday <= 31) {
    /* (a) month/day/year */
  } else {
    /* (b) year/month/day */
    if (mon > 31 && mday <= 12 && year <= 31 && !seenFullYear) {
      int temp = year;
      year = mon;
      mon = mday;
      mday = temp;
    } else {
      return false;
    }
  }

  // If the year is greater than or equal to 50 and less than 100, it is
  // considered to be the number of years after 1900. If the year is less
  // than 50 it is considered to be the number of years after 2000,
  // otherwise it is considered to be the number of years after 0.
  if (!seenFullYear) {
    if (year < 50) {
      year += 2000;
    } else if (year >= 50 && year < 100) {
      year += 1900;
    }
  }

  if (negativeYear) {
    year = -year;
  }

  mon -= 1; /* convert month to 0-based */
  if (sec < 0) {
    sec = 0;
  }
  if (min < 0) {
    min = 0;
  }
  if (hour < 0) {
    hour = 0;
  }

  double msec = MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, 0));

  if (tzOffset == -1) { /* no time zone specified, have to use local */
    msec = UTC(msec);
  } else {
    msec += tzOffset * msPerMinute;
  }

  *result = TimeClip(msec);
  return true;
}

static bool ParseDate(JSLinearString* s, ClippedTime* result) {
  AutoCheckCannotGC nogc;
  return s->hasLatin1Chars()
             ? ParseDate(s->latin1Chars(nogc), s->length(), result)
             : ParseDate(s->twoByteChars(nogc), s->length(), result);
}

static bool date_parse(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  if (args.length() == 0) {
    args.rval().setNaN();
    return true;
  }

  JSString* str = ToString<CanGC>(cx, args[0]);
  if (!str) {
    return false;
  }

  JSLinearString* linearStr = str->ensureLinear(cx);
  if (!linearStr) {
    return false;
  }

  ClippedTime result;
  if (!ParseDate(linearStr, &result)) {
    args.rval().setNaN();
    return true;
  }

  args.rval().set(TimeValue(result));
  return true;
}

static ClippedTime NowAsMillis(JSContext* cx) {
  double now = PRMJ_Now();
  bool clampAndJitter = cx->realm()->behaviors().clampAndJitterTime();
  if (clampAndJitter && sReduceMicrosecondTimePrecisionCallback) {
    now = sReduceMicrosecondTimePrecisionCallback(now);
  } else if (clampAndJitter && sResolutionUsec) {
    double clamped = floor(now / sResolutionUsec) * sResolutionUsec;

    if (sJitter) {
      // Calculate a random midpoint for jittering. In the browser, we are
      // adversarial: Web Content may try to calculate the midpoint themselves
      // and use that to bypass it's security. In the JS Shell, we are not
      // adversarial, we want to jitter the time to recreate the operating
      // environment, but we do not concern ourselves with trying to prevent an
      // attacker from calculating the midpoint themselves. So we use a very
      // simple, very fast CRC with a hardcoded seed.

      uint64_t midpoint = BitwiseCast<uint64_t>(clamped);
      midpoint ^= 0x0F00DD1E2BAD2DED;  // XOR in a 'secret'
      // MurmurHash3 internal component from
      //   https://searchfox.org/mozilla-central/rev/61d400da1c692453c2dc2c1cf37b616ce13dea5b/dom/canvas/MurmurHash3.cpp#85
      midpoint ^= midpoint >> 33;
      midpoint *= uint64_t{0xFF51AFD7ED558CCD};
      midpoint ^= midpoint >> 33;
      midpoint *= uint64_t{0xC4CEB9FE1A85EC53};
      midpoint ^= midpoint >> 33;
      midpoint %= sResolutionUsec;

      if (now > clamped + midpoint) {  // We're jittering up to the next step
        now = clamped + sResolutionUsec;
      } else {  // We're staying at the clamped value
        now = clamped;
      }
    } else {  // No jitter, only clamping
      now = clamped;
    }
  }

  return TimeClip(now / PRMJ_USEC_PER_MSEC);
}

bool js::date_now(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  args.rval().set(TimeValue(NowAsMillis(cx)));
  return true;
}

void DateObject::setUTCTime(ClippedTime t) {
  for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++) {
    setReservedSlot(ind, UndefinedValue());
  }

  setFixedSlot(UTC_TIME_SLOT, TimeValue(t));
}

void DateObject::setUTCTime(ClippedTime t, MutableHandleValue vp) {
  setUTCTime(t);
  vp.set(TimeValue(t));
}

void DateObject::fillLocalTimeSlots() {
  const int32_t utcTZOffset = DateTimeInfo::utcToLocalStandardOffsetSeconds();

  /* Check if the cache is already populated. */
  if (!getReservedSlot(LOCAL_TIME_SLOT).isUndefined() &&
      getReservedSlot(UTC_TIME_ZONE_OFFSET_SLOT).toInt32() == utcTZOffset) {
    return;
  }

  /* Remember time zone used to generate the local cache. */
  setReservedSlot(UTC_TIME_ZONE_OFFSET_SLOT, Int32Value(utcTZOffset));

  double utcTime = UTCTime().toNumber();

  if (!IsFinite(utcTime)) {
    for (size_t ind = COMPONENTS_START_SLOT; ind < RESERVED_SLOTS; ind++) {
      setReservedSlot(ind, DoubleValue(utcTime));
    }
    return;
  }

  double localTime = LocalTime(utcTime);

  setReservedSlot(LOCAL_TIME_SLOT, DoubleValue(localTime));

  int year = (int)floor(localTime / (msPerDay * 365.2425)) + 1970;
  double yearStartTime = TimeFromYear(year);

  /* Adjust the year in case the approximation was wrong, as in YearFromTime. */
  int yearDays;
  if (yearStartTime > localTime) {
    year--;
    yearStartTime -= (msPerDay * DaysInYear(year));
    yearDays = DaysInYear(year);
  } else {
    yearDays = DaysInYear(year);
    double nextStart = yearStartTime + (msPerDay * yearDays);
    if (nextStart <= localTime) {
      year++;
      yearStartTime = nextStart;
      yearDays = DaysInYear(year);
    }
  }

  setReservedSlot(LOCAL_YEAR_SLOT, Int32Value(year));

  uint64_t yearTime = uint64_t(localTime - yearStartTime);
  int yearSeconds = uint32_t(yearTime / 1000);

  int day = yearSeconds / int(SecondsPerDay);

  int step = -1, next = 30;
  int month;

  do {
    if (day <= next) {
      month = 0;
      break;
    }
    step = next;
    next += ((yearDays == 366) ? 29 : 28);
    if (day <= next) {
      month = 1;
      break;
    }
    step = next;
    if (day <= (next += 31)) {
      month = 2;
      break;
    }
    step = next;
    if (day <= (next += 30)) {
      month = 3;
      break;
    }
    step = next;
    if (day <= (next += 31)) {
      month = 4;
      break;
    }
    step = next;
    if (day <= (next += 30)) {
      month = 5;
      break;
    }
    step = next;
    if (day <= (next += 31)) {
      month = 6;
      break;
    }
    step = next;
    if (day <= (next += 31)) {
      month = 7;
      break;
    }
    step = next;
    if (day <= (next += 30)) {
      month = 8;
      break;
    }
    step = next;
    if (day <= (next += 31)) {
      month = 9;
      break;
    }
    step = next;
    if (day <= (next += 30)) {
      month = 10;
      break;
    }
    step = next;
    month = 11;
  } while (0);

  setReservedSlot(LOCAL_MONTH_SLOT, Int32Value(month));
  setReservedSlot(LOCAL_DATE_SLOT, Int32Value(day - step));

  int weekday = WeekDay(localTime);
  setReservedSlot(LOCAL_DAY_SLOT, Int32Value(weekday));

  setReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT, Int32Value(yearSeconds));
}

inline double DateObject::cachedLocalTime() {
  fillLocalTimeSlots();
  return getReservedSlot(LOCAL_TIME_SLOT).toDouble();
}

MOZ_ALWAYS_INLINE bool IsDate(HandleValue v) {
  return v.isObject() && v.toObject().is<DateObject>();
}

/*
 * See ECMA 15.9.5.4 thru 15.9.5.23
 */
/* static */ MOZ_ALWAYS_INLINE bool DateObject::getTime_impl(
    JSContext* cx, const CallArgs& args) {
  args.rval().set(args.thisv().toObject().as<DateObject>().UTCTime());
  return true;
}

static bool date_getTime(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getTime_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getYear_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  Value yearVal = dateObj->getReservedSlot(LOCAL_YEAR_SLOT);
  if (yearVal.isInt32()) {
    /* Follow ECMA-262 to the letter, contrary to IE JScript. */
    int year = yearVal.toInt32() - 1900;
    args.rval().setInt32(year);
  } else {
    args.rval().set(yearVal);
  }

  return true;
}

static bool date_getYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getYear_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getFullYear_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  args.rval().set(dateObj->getReservedSlot(LOCAL_YEAR_SLOT));
  return true;
}

static bool date_getFullYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getFullYear_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCFullYear_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = YearFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCFullYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCFullYear_impl>(cx,
                                                                       args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getMonth_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  args.rval().set(dateObj->getReservedSlot(LOCAL_MONTH_SLOT));
  return true;
}

static bool date_getMonth(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getMonth_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCMonth_impl(
    JSContext* cx, const CallArgs& args) {
  double d = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  args.rval().setNumber(MonthFromTime(d));
  return true;
}

static bool date_getUTCMonth(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCMonth_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getDate_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  args.rval().set(dateObj->getReservedSlot(LOCAL_DATE_SLOT));
  return true;
}

static bool date_getDate(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getDate_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCDate_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = DateFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCDate(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCDate_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getDay_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  args.rval().set(dateObj->getReservedSlot(LOCAL_DAY_SLOT));
  return true;
}

static bool date_getDay(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getDay_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCDay_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = WeekDay(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCDay(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCDay_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getHours_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  // Note: LOCAL_SECONDS_INTO_YEAR_SLOT is guaranteed to contain an
  // int32 or NaN after the call to fillLocalTimeSlots.
  Value yearSeconds = dateObj->getReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT);
  if (yearSeconds.isDouble()) {
    MOZ_ASSERT(IsNaN(yearSeconds.toDouble()));
    args.rval().set(yearSeconds);
  } else {
    args.rval().setInt32((yearSeconds.toInt32() / int(SecondsPerHour)) %
                         int(HoursPerDay));
  }
  return true;
}

static bool date_getHours(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getHours_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCHours_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = HourFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCHours(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCHours_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getMinutes_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  // Note: LOCAL_SECONDS_INTO_YEAR_SLOT is guaranteed to contain an
  // int32 or NaN after the call to fillLocalTimeSlots.
  Value yearSeconds = dateObj->getReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT);
  if (yearSeconds.isDouble()) {
    MOZ_ASSERT(IsNaN(yearSeconds.toDouble()));
    args.rval().set(yearSeconds);
  } else {
    args.rval().setInt32((yearSeconds.toInt32() / int(SecondsPerMinute)) %
                         int(MinutesPerHour));
  }
  return true;
}

static bool date_getMinutes(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getMinutes_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCMinutes_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = MinFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCMinutes(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCMinutes_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getSeconds_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  dateObj->fillLocalTimeSlots();

  // Note: LOCAL_SECONDS_INTO_YEAR_SLOT is guaranteed to contain an
  // int32 or NaN after the call to fillLocalTimeSlots.
  Value yearSeconds = dateObj->getReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT);
  if (yearSeconds.isDouble()) {
    MOZ_ASSERT(IsNaN(yearSeconds.toDouble()));
    args.rval().set(yearSeconds);
  } else {
    args.rval().setInt32(yearSeconds.toInt32() % int(SecondsPerMinute));
  }
  return true;
}

static bool date_getSeconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getSeconds_impl>(cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCSeconds_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = SecFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCSeconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCSeconds_impl>(cx, args);
}

/*
 * Date.getMilliseconds is mapped to getUTCMilliseconds. As long as no
 * supported time zone has a fractional-second component, the differences in
 * their specifications aren't observable.
 *
 * The 'tz' database explicitly does not support fractional-second time zones.
 * For example the Netherlands observed Amsterdam Mean Time, estimated to be
 * UT +00:19:32.13, from 1909 to 1937, but in tzdata AMT is defined as exactly
 * UT +00:19:32.
 */

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getUTCMilliseconds_impl(
    JSContext* cx, const CallArgs& args) {
  double result = args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (IsFinite(result)) {
    result = msFromTime(result);
  }

  args.rval().setNumber(result);
  return true;
}

static bool date_getUTCMilliseconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getUTCMilliseconds_impl>(
      cx, args);
}

/* static */ MOZ_ALWAYS_INLINE bool DateObject::getTimezoneOffset_impl(
    JSContext* cx, const CallArgs& args) {
  DateObject* dateObj = &args.thisv().toObject().as<DateObject>();
  double utctime = dateObj->UTCTime().toNumber();
  double localtime = dateObj->cachedLocalTime();

  /*
   * Return the time zone offset in minutes for the current locale that is
   * appropriate for this time. This value would be a constant except for
   * daylight savings time.
   */
  double result = (utctime - localtime) / msPerMinute;
  args.rval().setNumber(result);
  return true;
}

static bool date_getTimezoneOffset(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, DateObject::getTimezoneOffset_impl>(cx,
                                                                          args);
}

MOZ_ALWAYS_INLINE bool date_setTime_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());
  if (args.length() == 0) {
    dateObj->setUTCTime(ClippedTime::invalid(), args.rval());
    return true;
  }

  double result;
  if (!ToNumber(cx, args[0], &result)) {
    return false;
  }

  dateObj->setUTCTime(TimeClip(result), args.rval());
  return true;
}

static bool date_setTime(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setTime_impl>(cx, args);
}

static bool GetMsecsOrDefault(JSContext* cx, const CallArgs& args, unsigned i,
                              double t, double* millis) {
  if (args.length() <= i) {
    *millis = msFromTime(t);
    return true;
  }
  return ToNumber(cx, args[i], millis);
}

static bool GetSecsOrDefault(JSContext* cx, const CallArgs& args, unsigned i,
                             double t, double* sec) {
  if (args.length() <= i) {
    *sec = SecFromTime(t);
    return true;
  }
  return ToNumber(cx, args[i], sec);
}

static bool GetMinsOrDefault(JSContext* cx, const CallArgs& args, unsigned i,
                             double t, double* mins) {
  if (args.length() <= i) {
    *mins = MinFromTime(t);
    return true;
  }
  return ToNumber(cx, args[i], mins);
}

/* ES6 20.3.4.23. */
MOZ_ALWAYS_INLINE bool date_setMilliseconds_impl(JSContext* cx,
                                                 const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  // Steps 1-2.
  double t = LocalTime(dateObj->UTCTime().toNumber());

  // Steps 3-4.
  double ms;
  if (!ToNumber(cx, args.get(0), &ms)) {
    return false;
  }

  // Step 5.
  double time = MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), ms);

  // Step 6.
  ClippedTime u = TimeClip(UTC(MakeDate(Day(t), time)));

  // Steps 7-8.
  dateObj->setUTCTime(u, args.rval());
  return true;
}

static bool date_setMilliseconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setMilliseconds_impl>(cx, args);
}

/* ES5 15.9.5.29. */
MOZ_ALWAYS_INLINE bool date_setUTCMilliseconds_impl(JSContext* cx,
                                                    const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double milli;
  if (!ToNumber(cx, args.get(0), &milli)) {
    return false;
  }
  double time =
      MakeTime(HourFromTime(t), MinFromTime(t), SecFromTime(t), milli);

  /* Step 3. */
  ClippedTime v = TimeClip(MakeDate(Day(t), time));

  /* Steps 4-5. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

static bool date_setUTCMilliseconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCMilliseconds_impl>(cx, args);
}

/* ES5 15.9.5.30. */
MOZ_ALWAYS_INLINE bool date_setSeconds_impl(JSContext* cx,
                                            const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  // Steps 1-2.
  double t = LocalTime(dateObj->UTCTime().toNumber());

  // Steps 3-4.
  double s;
  if (!ToNumber(cx, args.get(0), &s)) {
    return false;
  }

  // Steps 5-6.
  double milli;
  if (!GetMsecsOrDefault(cx, args, 1, t, &milli)) {
    return false;
  }

  // Step 7.
  double date =
      MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

  // Step 8.
  ClippedTime u = TimeClip(UTC(date));

  // Step 9.
  dateObj->setUTCTime(u, args.rval());
  return true;
}

/* ES6 20.3.4.26. */
static bool date_setSeconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setSeconds_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setUTCSeconds_impl(JSContext* cx,
                                               const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double s;
  if (!ToNumber(cx, args.get(0), &s)) {
    return false;
  }

  /* Step 3. */
  double milli;
  if (!GetMsecsOrDefault(cx, args, 1, t, &milli)) {
    return false;
  }

  /* Step 4. */
  double date =
      MakeDate(Day(t), MakeTime(HourFromTime(t), MinFromTime(t), s, milli));

  /* Step 5. */
  ClippedTime v = TimeClip(date);

  /* Steps 6-7. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

/* ES5 15.9.5.32. */
static bool date_setUTCSeconds(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCSeconds_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setMinutes_impl(JSContext* cx,
                                            const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  // Steps 1-2.
  double t = LocalTime(dateObj->UTCTime().toNumber());

  // Steps 3-4.
  double m;
  if (!ToNumber(cx, args.get(0), &m)) {
    return false;
  }

  // Steps 5-6.
  double s;
  if (!GetSecsOrDefault(cx, args, 1, t, &s)) {
    return false;
  }

  // Steps 7-8.
  double milli;
  if (!GetMsecsOrDefault(cx, args, 2, t, &milli)) {
    return false;
  }

  // Step 9.
  double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

  // Step 10.
  ClippedTime u = TimeClip(UTC(date));

  // Steps 11-12.
  dateObj->setUTCTime(u, args.rval());
  return true;
}

/* ES6 20.3.4.24. */
static bool date_setMinutes(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2 (the effectful parts).
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setMinutes_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setUTCMinutes_impl(JSContext* cx,
                                               const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double m;
  if (!ToNumber(cx, args.get(0), &m)) {
    return false;
  }

  /* Step 3. */
  double s;
  if (!GetSecsOrDefault(cx, args, 1, t, &s)) {
    return false;
  }

  /* Step 4. */
  double milli;
  if (!GetMsecsOrDefault(cx, args, 2, t, &milli)) {
    return false;
  }

  /* Step 5. */
  double date = MakeDate(Day(t), MakeTime(HourFromTime(t), m, s, milli));

  /* Step 6. */
  ClippedTime v = TimeClip(date);

  /* Steps 7-8. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

/* ES5 15.9.5.34. */
static bool date_setUTCMinutes(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCMinutes_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setHours_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  // Steps 1-2.
  double t = LocalTime(dateObj->UTCTime().toNumber());

  // Steps 3-4.
  double h;
  if (!ToNumber(cx, args.get(0), &h)) {
    return false;
  }

  // Steps 5-6.
  double m;
  if (!GetMinsOrDefault(cx, args, 1, t, &m)) {
    return false;
  }

  // Steps 7-8.
  double s;
  if (!GetSecsOrDefault(cx, args, 2, t, &s)) {
    return false;
  }

  // Steps 9-10.
  double milli;
  if (!GetMsecsOrDefault(cx, args, 3, t, &milli)) {
    return false;
  }

  // Step 11.
  double date = MakeDate(Day(t), MakeTime(h, m, s, milli));

  // Step 12.
  ClippedTime u = TimeClip(UTC(date));

  // Steps 13-14.
  dateObj->setUTCTime(u, args.rval());
  return true;
}

/* ES5 15.9.5.35. */
static bool date_setHours(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setHours_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setUTCHours_impl(JSContext* cx,
                                             const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double h;
  if (!ToNumber(cx, args.get(0), &h)) {
    return false;
  }

  /* Step 3. */
  double m;
  if (!GetMinsOrDefault(cx, args, 1, t, &m)) {
    return false;
  }

  /* Step 4. */
  double s;
  if (!GetSecsOrDefault(cx, args, 2, t, &s)) {
    return false;
  }

  /* Step 5. */
  double milli;
  if (!GetMsecsOrDefault(cx, args, 3, t, &milli)) {
    return false;
  }

  /* Step 6. */
  double newDate = MakeDate(Day(t), MakeTime(h, m, s, milli));

  /* Step 7. */
  ClippedTime v = TimeClip(newDate);

  /* Steps 8-9. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

/* ES5 15.9.5.36. */
static bool date_setUTCHours(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCHours_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setDate_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = LocalTime(dateObj->UTCTime().toNumber());

  /* Step 2. */
  double date;
  if (!ToNumber(cx, args.get(0), &date)) {
    return false;
  }

  /* Step 3. */
  double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date),
                            TimeWithinDay(t));

  /* Step 4. */
  ClippedTime u = TimeClip(UTC(newDate));

  /* Steps 5-6. */
  dateObj->setUTCTime(u, args.rval());
  return true;
}

/* ES5 15.9.5.37. */
static bool date_setDate(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setDate_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_setUTCDate_impl(JSContext* cx,
                                            const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double date;
  if (!ToNumber(cx, args.get(0), &date)) {
    return false;
  }

  /* Step 3. */
  double newDate = MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), date),
                            TimeWithinDay(t));

  /* Step 4. */
  ClippedTime v = TimeClip(newDate);

  /* Steps 5-6. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

static bool date_setUTCDate(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCDate_impl>(cx, args);
}

static bool GetDateOrDefault(JSContext* cx, const CallArgs& args, unsigned i,
                             double t, double* date) {
  if (args.length() <= i) {
    *date = DateFromTime(t);
    return true;
  }
  return ToNumber(cx, args[i], date);
}

static bool GetMonthOrDefault(JSContext* cx, const CallArgs& args, unsigned i,
                              double t, double* month) {
  if (args.length() <= i) {
    *month = MonthFromTime(t);
    return true;
  }
  return ToNumber(cx, args[i], month);
}

/* ES5 15.9.5.38. */
MOZ_ALWAYS_INLINE bool date_setMonth_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = LocalTime(dateObj->UTCTime().toNumber());

  /* Step 2. */
  double m;
  if (!ToNumber(cx, args.get(0), &m)) {
    return false;
  }

  /* Step 3. */
  double date;
  if (!GetDateOrDefault(cx, args, 1, t, &date)) {
    return false;
  }

  /* Step 4. */
  double newDate =
      MakeDate(MakeDay(YearFromTime(t), m, date), TimeWithinDay(t));

  /* Step 5. */
  ClippedTime u = TimeClip(UTC(newDate));

  /* Steps 6-7. */
  dateObj->setUTCTime(u, args.rval());
  return true;
}

static bool date_setMonth(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setMonth_impl>(cx, args);
}

/* ES5 15.9.5.39. */
MOZ_ALWAYS_INLINE bool date_setUTCMonth_impl(JSContext* cx,
                                             const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = dateObj->UTCTime().toNumber();

  /* Step 2. */
  double m;
  if (!ToNumber(cx, args.get(0), &m)) {
    return false;
  }

  /* Step 3. */
  double date;
  if (!GetDateOrDefault(cx, args, 1, t, &date)) {
    return false;
  }

  /* Step 4. */
  double newDate =
      MakeDate(MakeDay(YearFromTime(t), m, date), TimeWithinDay(t));

  /* Step 5. */
  ClippedTime v = TimeClip(newDate);

  /* Steps 6-7. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

static bool date_setUTCMonth(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCMonth_impl>(cx, args);
}

static double ThisLocalTimeOrZero(Handle<DateObject*> dateObj) {
  double t = dateObj->UTCTime().toNumber();
  if (IsNaN(t)) {
    return +0;
  }
  return LocalTime(t);
}

static double ThisUTCTimeOrZero(Handle<DateObject*> dateObj) {
  double t = dateObj->as<DateObject>().UTCTime().toNumber();
  return IsNaN(t) ? +0 : t;
}

/* ES5 15.9.5.40. */
MOZ_ALWAYS_INLINE bool date_setFullYear_impl(JSContext* cx,
                                             const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = ThisLocalTimeOrZero(dateObj);

  /* Step 2. */
  double y;
  if (!ToNumber(cx, args.get(0), &y)) {
    return false;
  }

  /* Step 3. */
  double m;
  if (!GetMonthOrDefault(cx, args, 1, t, &m)) {
    return false;
  }

  /* Step 4. */
  double date;
  if (!GetDateOrDefault(cx, args, 2, t, &date)) {
    return false;
  }

  /* Step 5. */
  double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t));

  /* Step 6. */
  ClippedTime u = TimeClip(UTC(newDate));

  /* Steps 7-8. */
  dateObj->setUTCTime(u, args.rval());
  return true;
}

static bool date_setFullYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setFullYear_impl>(cx, args);
}

/* ES5 15.9.5.41. */
MOZ_ALWAYS_INLINE bool date_setUTCFullYear_impl(JSContext* cx,
                                                const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = ThisUTCTimeOrZero(dateObj);

  /* Step 2. */
  double y;
  if (!ToNumber(cx, args.get(0), &y)) {
    return false;
  }

  /* Step 3. */
  double m;
  if (!GetMonthOrDefault(cx, args, 1, t, &m)) {
    return false;
  }

  /* Step 4. */
  double date;
  if (!GetDateOrDefault(cx, args, 2, t, &date)) {
    return false;
  }

  /* Step 5. */
  double newDate = MakeDate(MakeDay(y, m, date), TimeWithinDay(t));

  /* Step 6. */
  ClippedTime v = TimeClip(newDate);

  /* Steps 7-8. */
  dateObj->setUTCTime(v, args.rval());
  return true;
}

static bool date_setUTCFullYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setUTCFullYear_impl>(cx, args);
}

/* ES5 Annex B.2.5. */
MOZ_ALWAYS_INLINE bool date_setYear_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());

  /* Step 1. */
  double t = ThisLocalTimeOrZero(dateObj);

  /* Step 2. */
  double y;
  if (!ToNumber(cx, args.get(0), &y)) {
    return false;
  }

  /* Step 3. */
  if (IsNaN(y)) {
    dateObj->setUTCTime(ClippedTime::invalid(), args.rval());
    return true;
  }

  /* Step 4. */
  double yint = ToInteger(y);
  if (0 <= yint && yint <= 99) {
    yint += 1900;
  }

  /* Step 5. */
  double day = MakeDay(yint, MonthFromTime(t), DateFromTime(t));

  /* Step 6. */
  double u = UTC(MakeDate(day, TimeWithinDay(t)));

  /* Steps 7-8. */
  dateObj->setUTCTime(TimeClip(u), args.rval());
  return true;
}

static bool date_setYear(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_setYear_impl>(cx, args);
}

/* constants for toString, toUTCString */
static const char* const days[] = {"Sun", "Mon", "Tue", "Wed",
                                   "Thu", "Fri", "Sat"};
static const char* const months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

/* ES5 B.2.6. */
MOZ_ALWAYS_INLINE bool date_toGMTString_impl(JSContext* cx,
                                             const CallArgs& args) {
  double utctime =
      args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (!IsFinite(utctime)) {
    args.rval().setString(cx->names().InvalidDate);
    return true;
  }

  char buf[100];
  SprintfLiteral(buf, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
                 days[int(WeekDay(utctime))], int(DateFromTime(utctime)),
                 months[int(MonthFromTime(utctime))],
                 int(YearFromTime(utctime)), int(HourFromTime(utctime)),
                 int(MinFromTime(utctime)), int(SecFromTime(utctime)));

  JSString* str = NewStringCopyZ<CanGC>(cx, buf);
  if (!str) {
    return false;
  }

  args.rval().setString(str);
  return true;
}

static bool date_toGMTString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toGMTString_impl>(cx, args);
}

/* ES6 draft 2015-01-15 20.3.4.36. */
MOZ_ALWAYS_INLINE bool date_toISOString_impl(JSContext* cx,
                                             const CallArgs& args) {
  double utctime =
      args.thisv().toObject().as<DateObject>().UTCTime().toNumber();
  if (!IsFinite(utctime)) {
    JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr,
                              JSMSG_INVALID_DATE);
    return false;
  }

  char buf[100];
  int year = int(YearFromTime(utctime));
  if (year < 0 || year > 9999) {
    SprintfLiteral(buf, "%+.6d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ",
                   int(YearFromTime(utctime)), int(MonthFromTime(utctime)) + 1,
                   int(DateFromTime(utctime)), int(HourFromTime(utctime)),
                   int(MinFromTime(utctime)), int(SecFromTime(utctime)),
                   int(msFromTime(utctime)));
  } else {
    SprintfLiteral(buf, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d.%.3dZ",
                   int(YearFromTime(utctime)), int(MonthFromTime(utctime)) + 1,
                   int(DateFromTime(utctime)), int(HourFromTime(utctime)),
                   int(MinFromTime(utctime)), int(SecFromTime(utctime)),
                   int(msFromTime(utctime)));
  }

  JSString* str = NewStringCopyZ<CanGC>(cx, buf);
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
}

static bool date_toISOString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toISOString_impl>(cx, args);
}

/* ES5 15.9.5.44. */
static bool date_toJSON(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  /* Step 1. */
  RootedObject obj(cx, ToObject(cx, args.thisv()));
  if (!obj) {
    return false;
  }

  /* Step 2. */
  RootedValue tv(cx, ObjectValue(*obj));
  if (!ToPrimitive(cx, JSTYPE_NUMBER, &tv)) {
    return false;
  }

  /* Step 3. */
  if (tv.isDouble() && !IsFinite(tv.toDouble())) {
    args.rval().setNull();
    return true;
  }

  /* Step 4. */
  RootedValue toISO(cx);
  if (!GetProperty(cx, obj, obj, cx->names().toISOString, &toISO)) {
    return false;
  }

  /* Step 5. */
  if (!IsCallable(toISO)) {
    JS_ReportErrorNumberASCII(cx, js::GetErrorMessage, nullptr,
                              JSMSG_BAD_TOISOSTRING_PROP);
    return false;
  }

  /* Step 6. */
  return Call(cx, toISO, obj, args.rval());
}

#if ENABLE_INTL_API && !MOZ_SYSTEM_ICU
JSString* DateTimeHelper::timeZoneComment(JSContext* cx, double utcTime,
                                          double localTime) {
  const char* locale = cx->runtime()->getDefaultLocale();
  if (!locale) {
    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                              JSMSG_DEFAULT_LOCALE_ERROR);
    return nullptr;
  }

  char16_t tzbuf[100];
  tzbuf[0] = ' ';
  tzbuf[1] = '(';

  char16_t* timeZoneStart = tzbuf + 2;
  constexpr size_t remainingSpace =
      mozilla::ArrayLength(tzbuf) - 2 - 1;  // for the trailing ')'

  int64_t utcMilliseconds = static_cast<int64_t>(utcTime);
  if (!DateTimeInfo::timeZoneDisplayName(timeZoneStart, remainingSpace,
                                         utcMilliseconds, locale)) {
    {
      JS_ReportOutOfMemory(cx);
    }
    return nullptr;
  }

  // Reject if the result string is empty.
  size_t len = js_strlen(timeZoneStart);
  if (len == 0) {
    return cx->names().empty;
  }

  // Parenthesize the returned display name.
  timeZoneStart[len] = ')';

  return NewStringCopyN<CanGC>(cx, tzbuf, 2 + len + 1);
}
#else
/* Interface to PRMJTime date struct. */
PRMJTime DateTimeHelper::toPRMJTime(double localTime, double utcTime) {
  double year = YearFromTime(localTime);

  PRMJTime prtm;
  prtm.tm_usec = int32_t(msFromTime(localTime)) * 1000;
  prtm.tm_sec = int8_t(SecFromTime(localTime));
  prtm.tm_min = int8_t(MinFromTime(localTime));
  prtm.tm_hour = int8_t(HourFromTime(localTime));
  prtm.tm_mday = int8_t(DateFromTime(localTime));
  prtm.tm_mon = int8_t(MonthFromTime(localTime));
  prtm.tm_wday = int8_t(WeekDay(localTime));
  prtm.tm_year = year;
  prtm.tm_yday = int16_t(DayWithinYear(localTime, year));
  prtm.tm_isdst = (daylightSavingTA(utcTime) != 0);

  return prtm;
}

size_t DateTimeHelper::formatTime(char* buf, size_t buflen, const char* fmt,
                                  double utcTime, double localTime) {
  PRMJTime prtm = toPRMJTime(localTime, utcTime);

  // If an equivalent year was used to compute the date/time components, use
  // the same equivalent year to determine the time zone name and offset in
  // PRMJ_FormatTime(...).
  int timeZoneYear = isRepresentableAsTime32(utcTime)
                         ? prtm.tm_year
                         : equivalentYearForDST(prtm.tm_year);
  int offsetInSeconds = (int)floor((localTime - utcTime) / msPerSecond);

  return PRMJ_FormatTime(buf, buflen, fmt, &prtm, timeZoneYear,
                         offsetInSeconds);
}

JSString* DateTimeHelper::timeZoneComment(JSContext* cx, double utcTime,
                                          double localTime) {
  char tzbuf[100];

  size_t tzlen = formatTime(tzbuf, sizeof tzbuf, " (%Z)", utcTime, localTime);
  if (tzlen != 0) {
    // Decide whether to use the resulting time zone string.
    //
    // Reject it if it contains any non-ASCII or non-printable characters.
    // It's then likely in some other character encoding, and we probably
    // won't display it correctly.
    bool usetz = true;
    for (size_t i = 0; i < tzlen; i++) {
      char16_t c = tzbuf[i];
      if (!IsAsciiPrintable(c)) {
        usetz = false;
        break;
      }
    }

    // Also reject it if it's not parenthesized or if it's ' ()'.
    if (tzbuf[0] != ' ' || tzbuf[1] != '(' || tzbuf[2] == ')') {
      usetz = false;
    }

    if (usetz) {
      return NewStringCopyN<CanGC>(cx, tzbuf, tzlen);
    }
  }

  return cx->names().empty;
}
#endif /* ENABLE_INTL_API && !MOZ_SYSTEM_ICU */

static JSString* TimeZoneComment(JSContext* cx, double utcTime,
                                 double localTime) {
  return DateTimeHelper::timeZoneComment(cx, utcTime, localTime);
}

enum class FormatSpec { DateTime, Date, Time };

static bool FormatDate(JSContext* cx, double utcTime, FormatSpec format,
                       MutableHandleValue rval) {
  if (!IsFinite(utcTime)) {
    rval.setString(cx->names().InvalidDate);
    return true;
  }

  MOZ_ASSERT(NumbersAreIdentical(TimeClip(utcTime).toDouble(), utcTime));

  double localTime = LocalTime(utcTime);

  int offset = 0;
  RootedString timeZoneComment(cx);
  if (format == FormatSpec::DateTime || format == FormatSpec::Time) {
    // Offset from GMT in minutes. The offset includes daylight savings,
    // if it applies.
    int minutes = (int)trunc((localTime - utcTime) / msPerMinute);

    // Map 510 minutes to 0830 hours.
    offset = (minutes / 60) * 100 + minutes % 60;

    // Print as "Wed Nov 05 1997 19:38:03 GMT-0800 (PST)".
    //
    // The TZA is printed as 'GMT-0800' rather than as 'PST' to avoid
    // operating-system dependence on strftime (which PRMJ_FormatTime
    // calls, for %Z only.) win32 prints PST as 'Pacific Standard Time.'
    // This way we always know what we're getting, and can parse it if
    // we produce it. The OS time zone string is included as a comment.
    //
    // When ICU is used to retrieve the time zone string, the localized
    // 'long' name format from CLDR is used. For example when the default
    // locale is "en-US", PST is displayed as 'Pacific Standard Time', but
    // when it is "ru", 'Тихоокеанское стандартное время' is used. This
    // also means the time zone string may not fit into Latin-1.

    // Get a time zone string from the OS or ICU to include as a comment.
    timeZoneComment = TimeZoneComment(cx, utcTime, localTime);
    if (!timeZoneComment) {
      return false;
    }
  }

  char buf[100];
  switch (format) {
    case FormatSpec::DateTime:
      /* Tue Oct 31 2000 09:41:40 GMT-0800 */
      SprintfLiteral(buf, "%s %s %.2d %.4d %.2d:%.2d:%.2d GMT%+.4d",
                     days[int(WeekDay(localTime))],
                     months[int(MonthFromTime(localTime))],
                     int(DateFromTime(localTime)), int(YearFromTime(localTime)),
                     int(HourFromTime(localTime)), int(MinFromTime(localTime)),
                     int(SecFromTime(localTime)), offset);
      break;
    case FormatSpec::Date:
      /* Tue Oct 31 2000 */
      SprintfLiteral(buf, "%s %s %.2d %.4d", days[int(WeekDay(localTime))],
                     months[int(MonthFromTime(localTime))],
                     int(DateFromTime(localTime)),
                     int(YearFromTime(localTime)));
      break;
    case FormatSpec::Time:
      /* 09:41:40 GMT-0800 */
      SprintfLiteral(buf, "%.2d:%.2d:%.2d GMT%+.4d",
                     int(HourFromTime(localTime)), int(MinFromTime(localTime)),
                     int(SecFromTime(localTime)), offset);
      break;
  }

  RootedString str(cx, NewStringCopyZ<CanGC>(cx, buf));
  if (!str) {
    return false;
  }

  // Append the time zone string if present.
  if (timeZoneComment && !timeZoneComment->empty()) {
    str = js::ConcatStrings<CanGC>(cx, str, timeZoneComment);
    if (!str) {
      return false;
    }
  }

  rval.setString(str);
  return true;
}

#if !ENABLE_INTL_API
static bool ToLocaleFormatHelper(JSContext* cx, HandleObject obj,
                                 const char* format, MutableHandleValue rval) {
  double utcTime = obj->as<DateObject>().UTCTime().toNumber();

  char buf[100];
  if (!IsFinite(utcTime)) {
    strcpy(buf, js_InvalidDate_str);
  } else {
    double localTime = LocalTime(utcTime);

    /* Let PRMJTime format it. */
    size_t result_len =
        DateTimeHelper::formatTime(buf, sizeof buf, format, utcTime, localTime);

    /* If it failed, default to toString. */
    if (result_len == 0) {
      return FormatDate(cx, utcTime, FormatSpec::DateTime, rval);
    }

    /* Hacked check against undesired 2-digit year 00/00/00 form. */
    if (strcmp(format, "%x") == 0 && result_len >= 6 &&
        /* Format %x means use OS settings, which may have 2-digit yr, so
           hack end of 3/11/22 or 11.03.22 or 11Mar22 to use 4-digit yr...*/
        !IsAsciiDigit(buf[result_len - 3]) &&
        IsAsciiDigit(buf[result_len - 2]) &&
        IsAsciiDigit(buf[result_len - 1]) &&
        /* ...but not if starts with 4-digit year, like 2022/3/11. */
        !(IsAsciiDigit(buf[0]) && IsAsciiDigit(buf[1]) &&
          IsAsciiDigit(buf[2]) && IsAsciiDigit(buf[3]))) {
      int year = int(YearFromTime(localTime));
      snprintf(buf + (result_len - 2), (sizeof buf) - (result_len - 2), "%d",
               year);
    }
  }

  if (cx->runtime()->localeCallbacks &&
      cx->runtime()->localeCallbacks->localeToUnicode) {
    return cx->runtime()->localeCallbacks->localeToUnicode(cx, buf, rval);
  }

  JSString* str = NewStringCopyZ<CanGC>(cx, buf);
  if (!str) {
    return false;
  }
  rval.setString(str);
  return true;
}

/* ES5 15.9.5.5. */
MOZ_ALWAYS_INLINE bool date_toLocaleString_impl(JSContext* cx,
                                                const CallArgs& args) {
  /*
   * Use '%#c' for windows, because '%c' is backward-compatible and non-y2k
   * with msvc; '%#c' requests that a full year be used in the result string.
   */
  static const char format[] =
#  if defined(_WIN32) && !defined(__MWERKS__)
      "%#c"
#  else
      "%c"
#  endif
      ;

  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());
  return ToLocaleFormatHelper(cx, dateObj, format, args.rval());
}

static bool date_toLocaleString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toLocaleString_impl>(cx, args);
}

/* ES5 15.9.5.6. */
MOZ_ALWAYS_INLINE bool date_toLocaleDateString_impl(JSContext* cx,
                                                    const CallArgs& args) {
  /*
   * Use '%#x' for windows, because '%x' is backward-compatible and non-y2k
   * with msvc; '%#x' requests that a full year be used in the result string.
   */
  static const char format[] =
#  if defined(_WIN32) && !defined(__MWERKS__)
      "%#x"
#  else
      "%x"
#  endif
      ;

  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());
  return ToLocaleFormatHelper(cx, dateObj, format, args.rval());
}

static bool date_toLocaleDateString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toLocaleDateString_impl>(cx, args);
}

/* ES5 15.9.5.7. */
MOZ_ALWAYS_INLINE bool date_toLocaleTimeString_impl(JSContext* cx,
                                                    const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());
  return ToLocaleFormatHelper(cx, dateObj, "%X", args.rval());
}

static bool date_toLocaleTimeString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toLocaleTimeString_impl>(cx, args);
}
#endif /* !ENABLE_INTL_API */

/* ES5 15.9.5.4. */
MOZ_ALWAYS_INLINE bool date_toTimeString_impl(JSContext* cx,
                                              const CallArgs& args) {
  return FormatDate(
      cx, args.thisv().toObject().as<DateObject>().UTCTime().toNumber(),
      FormatSpec::Time, args.rval());
}

static bool date_toTimeString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toTimeString_impl>(cx, args);
}

/* ES5 15.9.5.3. */
MOZ_ALWAYS_INLINE bool date_toDateString_impl(JSContext* cx,
                                              const CallArgs& args) {
  return FormatDate(
      cx, args.thisv().toObject().as<DateObject>().UTCTime().toNumber(),
      FormatSpec::Date, args.rval());
}

static bool date_toDateString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toDateString_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_toSource_impl(JSContext* cx, const CallArgs& args) {
  JSStringBuilder sb(cx);
  if (!sb.append("(new Date(") ||
      !NumberValueToStringBuffer(
          cx, args.thisv().toObject().as<DateObject>().UTCTime(), sb) ||
      !sb.append("))")) {
    return false;
  }

  JSString* str = sb.finishString();
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
}

static bool date_toSource(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toSource_impl>(cx, args);
}

// ES6 20.3.4.41.
MOZ_ALWAYS_INLINE bool date_toString_impl(JSContext* cx, const CallArgs& args) {
  // Steps 1-2.
  return FormatDate(
      cx, args.thisv().toObject().as<DateObject>().UTCTime().toNumber(),
      FormatSpec::DateTime, args.rval());
}

bool date_toString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_toString_impl>(cx, args);
}

MOZ_ALWAYS_INLINE bool date_valueOf_impl(JSContext* cx, const CallArgs& args) {
  Rooted<DateObject*> dateObj(cx, &args.thisv().toObject().as<DateObject>());
  args.rval().set(dateObj->UTCTime());
  return true;
}

bool js::date_valueOf(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsDate, date_valueOf_impl>(cx, args);
}

// ES6 20.3.4.45 Date.prototype[@@toPrimitive]
static bool date_toPrimitive(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Steps 1-2.
  if (!args.thisv().isObject()) {
    ReportIncompatible(cx, args);
    return false;
  }

  // Steps 3-5.
  JSType hint;
  if (!GetFirstArgumentAsTypeHint(cx, args, &hint)) {
    return false;
  }
  if (hint == JSTYPE_UNDEFINED) {
    hint = JSTYPE_STRING;
  }

  args.rval().set(args.thisv());
  RootedObject obj(cx, &args.thisv().toObject());
  return OrdinaryToPrimitive(cx, obj, hint, args.rval());
}

static const JSFunctionSpec date_static_methods[] = {
    JS_FN("UTC", date_UTC, 7, 0), JS_FN("parse", date_parse, 1, 0),
    JS_FN("now", date_now, 0, 0), JS_FS_END};

static const JSFunctionSpec date_methods[] = {
    JS_FN("getTime", date_getTime, 0, 0),
    JS_FN("getTimezoneOffset", date_getTimezoneOffset, 0, 0),
    JS_FN("getYear", date_getYear, 0, 0),
    JS_FN("getFullYear", date_getFullYear, 0, 0),
    JS_FN("getUTCFullYear", date_getUTCFullYear, 0, 0),
    JS_FN("getMonth", date_getMonth, 0, 0),
    JS_FN("getUTCMonth", date_getUTCMonth, 0, 0),
    JS_FN("getDate", date_getDate, 0, 0),
    JS_FN("getUTCDate", date_getUTCDate, 0, 0),
    JS_FN("getDay", date_getDay, 0, 0),
    JS_FN("getUTCDay", date_getUTCDay, 0, 0),
    JS_FN("getHours", date_getHours, 0, 0),
    JS_FN("getUTCHours", date_getUTCHours, 0, 0),
    JS_FN("getMinutes", date_getMinutes, 0, 0),
    JS_FN("getUTCMinutes", date_getUTCMinutes, 0, 0),
    JS_FN("getSeconds", date_getSeconds, 0, 0),
    JS_FN("getUTCSeconds", date_getUTCSeconds, 0, 0),
    JS_FN("getMilliseconds", date_getUTCMilliseconds, 0, 0),
    JS_FN("getUTCMilliseconds", date_getUTCMilliseconds, 0, 0),
    JS_FN("setTime", date_setTime, 1, 0),
    JS_FN("setYear", date_setYear, 1, 0),
    JS_FN("setFullYear", date_setFullYear, 3, 0),
    JS_FN("setUTCFullYear", date_setUTCFullYear, 3, 0),
    JS_FN("setMonth", date_setMonth, 2, 0),
    JS_FN("setUTCMonth", date_setUTCMonth, 2, 0),
    JS_FN("setDate", date_setDate, 1, 0),
    JS_FN("setUTCDate", date_setUTCDate, 1, 0),
    JS_FN("setHours", date_setHours, 4, 0),
    JS_FN("setUTCHours", date_setUTCHours, 4, 0),
    JS_FN("setMinutes", date_setMinutes, 3, 0),
    JS_FN("setUTCMinutes", date_setUTCMinutes, 3, 0),
    JS_FN("setSeconds", date_setSeconds, 2, 0),
    JS_FN("setUTCSeconds", date_setUTCSeconds, 2, 0),
    JS_FN("setMilliseconds", date_setMilliseconds, 1, 0),
    JS_FN("setUTCMilliseconds", date_setUTCMilliseconds, 1, 0),
    JS_FN("toUTCString", date_toGMTString, 0, 0),
#if ENABLE_INTL_API
    JS_SELF_HOSTED_FN(js_toLocaleString_str, "Date_toLocaleString", 0, 0),
    JS_SELF_HOSTED_FN("toLocaleDateString", "Date_toLocaleDateString", 0, 0),
    JS_SELF_HOSTED_FN("toLocaleTimeString", "Date_toLocaleTimeString", 0, 0),
#else
    JS_FN(js_toLocaleString_str, date_toLocaleString, 0, 0),
    JS_FN("toLocaleDateString", date_toLocaleDateString, 0, 0),
    JS_FN("toLocaleTimeString", date_toLocaleTimeString, 0, 0),
#endif
    JS_FN("toDateString", date_toDateString, 0, 0),
    JS_FN("toTimeString", date_toTimeString, 0, 0),
    JS_FN("toISOString", date_toISOString, 0, 0),
    JS_FN(js_toJSON_str, date_toJSON, 1, 0),
    JS_FN(js_toSource_str, date_toSource, 0, 0),
    JS_FN(js_toString_str, date_toString, 0, 0),
    JS_FN(js_valueOf_str, date_valueOf, 0, 0),
    JS_SYM_FN(toPrimitive, date_toPrimitive, 1, JSPROP_READONLY),
    JS_FS_END};

static bool NewDateObject(JSContext* cx, const CallArgs& args, ClippedTime t) {
  MOZ_ASSERT(args.isConstructing());

  RootedObject proto(cx);
  if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_Date, &proto)) {
    return false;
  }

  JSObject* obj = NewDateObjectMsec(cx, t, proto);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

static bool ToDateString(JSContext* cx, const CallArgs& args, ClippedTime t) {
  return FormatDate(cx, t.toDouble(), FormatSpec::DateTime, args.rval());
}

static bool DateNoArguments(JSContext* cx, const CallArgs& args) {
  MOZ_ASSERT(args.length() == 0);

  ClippedTime now = NowAsMillis(cx);

  if (args.isConstructing()) {
    return NewDateObject(cx, args, now);
  }

  return ToDateString(cx, args, now);
}

static bool DateOneArgument(JSContext* cx, const CallArgs& args) {
  MOZ_ASSERT(args.length() == 1);

  if (args.isConstructing()) {
    if (args[0].isObject()) {
      RootedObject obj(cx, &args[0].toObject());

      ESClass cls;
      if (!GetBuiltinClass(cx, obj, &cls)) {
        return false;
      }

      if (cls == ESClass::Date) {
        RootedValue unboxed(cx);
        if (!Unbox(cx, obj, &unboxed)) {
          return false;
        }

        return NewDateObject(cx, args, TimeClip(unboxed.toNumber()));
      }
    }

    if (!ToPrimitive(cx, args[0])) {
      return false;
    }

    ClippedTime t;
    if (args[0].isString()) {
      JSLinearString* linearStr = args[0].toString()->ensureLinear(cx);
      if (!linearStr) {
        return false;
      }

      if (!ParseDate(linearStr, &t)) {
        t = ClippedTime::invalid();
      }
    } else {
      double d;
      if (!ToNumber(cx, args[0], &d)) {
        return false;
      }
      t = TimeClip(d);
    }

    return NewDateObject(cx, args, t);
  }

  return ToDateString(cx, args, NowAsMillis(cx));
}

static bool DateMultipleArguments(JSContext* cx, const CallArgs& args) {
  MOZ_ASSERT(args.length() >= 2);

  // Step 3.
  if (args.isConstructing()) {
    // Steps 3a-b.
    double y;
    if (!ToNumber(cx, args[0], &y)) {
      return false;
    }

    // Steps 3c-d.
    double m;
    if (!ToNumber(cx, args[1], &m)) {
      return false;
    }

    // Steps 3e-f.
    double dt;
    if (args.length() >= 3) {
      if (!ToNumber(cx, args[2], &dt)) {
        return false;
      }
    } else {
      dt = 1;
    }

    // Steps 3g-h.
    double h;
    if (args.length() >= 4) {
      if (!ToNumber(cx, args[3], &h)) {
        return false;
      }
    } else {
      h = 0;
    }

    // Steps 3i-j.
    double min;
    if (args.length() >= 5) {
      if (!ToNumber(cx, args[4], &min)) {
        return false;
      }
    } else {
      min = 0;
    }

    // Steps 3k-l.
    double s;
    if (args.length() >= 6) {
      if (!ToNumber(cx, args[5], &s)) {
        return false;
      }
    } else {
      s = 0;
    }

    // Steps 3m-n.
    double milli;
    if (args.length() >= 7) {
      if (!ToNumber(cx, args[6], &milli)) {
        return false;
      }
    } else {
      milli = 0;
    }

    // Step 3o.
    double yr = y;
    if (!IsNaN(y)) {
      double yint = ToInteger(y);
      if (0 <= yint && yint <= 99) {
        yr = 1900 + yint;
      }
    }

    // Step 3p.
    double finalDate = MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli));

    // Steps 3q-t.
    return NewDateObject(cx, args, TimeClip(UTC(finalDate)));
  }

  return ToDateString(cx, args, NowAsMillis(cx));
}

static bool DateConstructor(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  if (args.length() == 0) {
    return DateNoArguments(cx, args);
  }

  if (args.length() == 1) {
    return DateOneArgument(cx, args);
  }

  return DateMultipleArguments(cx, args);
}

static bool FinishDateClassInit(JSContext* cx, HandleObject ctor,
                                HandleObject proto) {
  /*
   * Date.prototype.toGMTString has the same initial value as
   * Date.prototype.toUTCString.
   */
  RootedValue toUTCStringFun(cx);
  RootedId toUTCStringId(cx, NameToId(cx->names().toUTCString));
  RootedId toGMTStringId(cx, NameToId(cx->names().toGMTString));
  return NativeGetProperty(cx, proto.as<NativeObject>(), toUTCStringId,
                           &toUTCStringFun) &&
         NativeDefineDataProperty(cx, proto.as<NativeObject>(), toGMTStringId,
                                  toUTCStringFun, 0);
}

static const ClassSpec DateObjectClassSpec = {
    GenericCreateConstructor<DateConstructor, 7, gc::AllocKind::FUNCTION>,
    GenericCreatePrototype<DateObject>,
    date_static_methods,
    nullptr,
    date_methods,
    nullptr,
    FinishDateClassInit};

const JSClass DateObject::class_ = {js_Date_str,
                                    JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS) |
                                        JSCLASS_HAS_CACHED_PROTO(JSProto_Date),
                                    JS_NULL_CLASS_OPS, &DateObjectClassSpec};

const JSClass DateObject::protoClass_ = {
    js_Object_str, JSCLASS_HAS_CACHED_PROTO(JSProto_Date), JS_NULL_CLASS_OPS,
    &DateObjectClassSpec};

JSObject* js::NewDateObjectMsec(JSContext* cx, ClippedTime t,
                                HandleObject proto /* = nullptr */) {
  DateObject* obj = NewObjectWithClassProto<DateObject>(cx, proto);
  if (!obj) {
    return nullptr;
  }
  obj->setUTCTime(t);
  return obj;
}

JS_PUBLIC_API JSObject* JS::NewDateObject(JSContext* cx, ClippedTime time) {
  AssertHeapIsIdle();
  CHECK_THREAD(cx);
  return NewDateObjectMsec(cx, time);
}

JS_FRIEND_API JSObject* js::NewDateObject(JSContext* cx, int year, int mon,
                                          int mday, int hour, int min,
                                          int sec) {
  MOZ_ASSERT(mon < 12);
  double msec_time =
      MakeDate(MakeDay(year, mon, mday), MakeTime(hour, min, sec, 0.0));
  return NewDateObjectMsec(cx, TimeClip(UTC(msec_time)));
}

JS_FRIEND_API bool js::DateIsValid(JSContext* cx, HandleObject obj,
                                   bool* isValid) {
  ESClass cls;
  if (!GetBuiltinClass(cx, obj, &cls)) {
    return false;
  }

  if (cls != ESClass::Date) {
    *isValid = false;
    return true;
  }

  RootedValue unboxed(cx);
  if (!Unbox(cx, obj, &unboxed)) {
    return false;
  }

  *isValid = !IsNaN(unboxed.toNumber());
  return true;
}

JS_PUBLIC_API JSObject* JS::NewDateObject(JSContext* cx, int year, int mon,
                                          int mday, int hour, int min,
                                          int sec) {
  AssertHeapIsIdle();
  CHECK_THREAD(cx);
  return js::NewDateObject(cx, year, mon, mday, hour, min, sec);
}

JS_PUBLIC_API bool JS::ObjectIsDate(JSContext* cx, Handle<JSObject*> obj,
                                    bool* isDate) {
  cx->check(obj);

  ESClass cls;
  if (!GetBuiltinClass(cx, obj, &cls)) {
    return false;
  }

  *isDate = cls == ESClass::Date;
  return true;
}

JS_FRIEND_API bool js::DateGetMsecSinceEpoch(JSContext* cx, HandleObject obj,
                                             double* msecsSinceEpoch) {
  ESClass cls;
  if (!GetBuiltinClass(cx, obj, &cls)) {
    return false;
  }

  if (cls != ESClass::Date) {
    *msecsSinceEpoch = 0;
    return true;
  }

  RootedValue unboxed(cx);
  if (!Unbox(cx, obj, &unboxed)) {
    return false;
  }

  *msecsSinceEpoch = unboxed.toNumber();
  return true;
}