| /* |
| * Copyright (C) 1999-2000 Harri Porten (porten@kde.org) |
| * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * Copyright (C) 2007-2009 Torch Mobile, Inc. |
| * |
| * The Original Code is Mozilla Communicator client code, released |
| * March 31, 1998. |
| * |
| * The Initial Developer of the Original Code is |
| * Netscape Communications Corporation. |
| * Portions created by the Initial Developer are Copyright (C) 1998 |
| * the Initial Developer. All Rights Reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| * Alternatively, the contents of this file may be used under the terms |
| * of either the Mozilla Public License Version 1.1, found at |
| * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public |
| * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html |
| * (the "GPL"), in which case the provisions of the MPL or the GPL are |
| * applicable instead of those above. If you wish to allow use of your |
| * version of this file only under the terms of one of those two |
| * licenses (the MPL or the GPL) and not to allow others to use your |
| * version of this file under the LGPL, indicate your decision by |
| * deletingthe provisions above and replace them with the notice and |
| * other provisions required by the MPL or the GPL, as the case may be. |
| * If you do not delete the provisions above, a recipient may use your |
| * version of this file under any of the LGPL, the MPL or the GPL. |
| */ |
| |
| #include "config.h" |
| #include "DateMath.h" |
| |
| #include "Assertions.h" |
| #include "ASCIICType.h" |
| #include "CurrentTime.h" |
| #include "MathExtras.h" |
| #include "StringExtras.h" |
| |
| #include <algorithm> |
| #include <limits.h> |
| #include <limits> |
| #include <stdint.h> |
| #include <time.h> |
| |
| |
| #if HAVE(ERRNO_H) |
| #include <errno.h> |
| #endif |
| |
| #if PLATFORM(DARWIN) |
| #include <notify.h> |
| #endif |
| |
| #if HAVE(SYS_TIME_H) |
| #include <sys/time.h> |
| #endif |
| |
| #if HAVE(SYS_TIMEB_H) |
| #include <sys/timeb.h> |
| #endif |
| |
| #define NaN std::numeric_limits<double>::quiet_NaN() |
| |
| namespace WTF { |
| |
| /* Constants */ |
| |
| static const double minutesPerDay = 24.0 * 60.0; |
| static const double secondsPerDay = 24.0 * 60.0 * 60.0; |
| static const double secondsPerYear = 24.0 * 60.0 * 60.0 * 365.0; |
| |
| static const double usecPerSec = 1000000.0; |
| |
| static const double maxUnixTime = 2145859200.0; // 12/31/2037 |
| |
| // Day of year for the first day of each month, where index 0 is January, and day 0 is January 1. |
| // First for non-leap years, then for leap years. |
| static const int firstDayOfMonth[2][12] = { |
| {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}, |
| {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335} |
| }; |
| |
| static inline bool isLeapYear(int year) |
| { |
| if (year % 4 != 0) |
| return false; |
| if (year % 400 == 0) |
| return true; |
| if (year % 100 == 0) |
| return false; |
| return true; |
| } |
| |
| static inline int daysInYear(int year) |
| { |
| return 365 + isLeapYear(year); |
| } |
| |
| static inline double daysFrom1970ToYear(int year) |
| { |
| // The Gregorian Calendar rules for leap years: |
| // Every fourth year is a leap year. 2004, 2008, and 2012 are leap years. |
| // However, every hundredth year is not a leap year. 1900 and 2100 are not leap years. |
| // Every four hundred years, there's a leap year after all. 2000 and 2400 are leap years. |
| |
| static const int leapDaysBefore1971By4Rule = 1970 / 4; |
| static const int excludedLeapDaysBefore1971By100Rule = 1970 / 100; |
| static const int leapDaysBefore1971By400Rule = 1970 / 400; |
| |
| const double yearMinusOne = year - 1; |
| const double yearsToAddBy4Rule = floor(yearMinusOne / 4.0) - leapDaysBefore1971By4Rule; |
| const double yearsToExcludeBy100Rule = floor(yearMinusOne / 100.0) - excludedLeapDaysBefore1971By100Rule; |
| const double yearsToAddBy400Rule = floor(yearMinusOne / 400.0) - leapDaysBefore1971By400Rule; |
| |
| return 365.0 * (year - 1970) + yearsToAddBy4Rule - yearsToExcludeBy100Rule + yearsToAddBy400Rule; |
| } |
| |
| static inline double msToDays(double ms) |
| { |
| return floor(ms / msPerDay); |
| } |
| |
| static inline int msToYear(double ms) |
| { |
| int approxYear = static_cast<int>(floor(ms / (msPerDay * 365.2425)) + 1970); |
| double msFromApproxYearTo1970 = msPerDay * daysFrom1970ToYear(approxYear); |
| if (msFromApproxYearTo1970 > ms) |
| return approxYear - 1; |
| if (msFromApproxYearTo1970 + msPerDay * daysInYear(approxYear) <= ms) |
| return approxYear + 1; |
| return approxYear; |
| } |
| |
| static inline int dayInYear(double ms, int year) |
| { |
| return static_cast<int>(msToDays(ms) - daysFrom1970ToYear(year)); |
| } |
| |
| static inline double msToMilliseconds(double ms) |
| { |
| double result = fmod(ms, msPerDay); |
| if (result < 0) |
| result += msPerDay; |
| return result; |
| } |
| |
| // 0: Sunday, 1: Monday, etc. |
| static inline int msToWeekDay(double ms) |
| { |
| int wd = (static_cast<int>(msToDays(ms)) + 4) % 7; |
| if (wd < 0) |
| wd += 7; |
| return wd; |
| } |
| |
| static inline int msToSeconds(double ms) |
| { |
| double result = fmod(floor(ms / msPerSecond), secondsPerMinute); |
| if (result < 0) |
| result += secondsPerMinute; |
| return static_cast<int>(result); |
| } |
| |
| static inline int msToMinutes(double ms) |
| { |
| double result = fmod(floor(ms / msPerMinute), minutesPerHour); |
| if (result < 0) |
| result += minutesPerHour; |
| return static_cast<int>(result); |
| } |
| |
| static inline int msToHours(double ms) |
| { |
| double result = fmod(floor(ms/msPerHour), hoursPerDay); |
| if (result < 0) |
| result += hoursPerDay; |
| return static_cast<int>(result); |
| } |
| |
| static inline int monthFromDayInYear(int dayInYear, bool leapYear) |
| { |
| const int d = dayInYear; |
| int step; |
| |
| if (d < (step = 31)) |
| return 0; |
| step += (leapYear ? 29 : 28); |
| if (d < step) |
| 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; |
| } |
| |
| static inline bool checkMonth(int dayInYear, int& startDayOfThisMonth, int& startDayOfNextMonth, int daysInThisMonth) |
| { |
| startDayOfThisMonth = startDayOfNextMonth; |
| startDayOfNextMonth += daysInThisMonth; |
| return (dayInYear <= startDayOfNextMonth); |
| } |
| |
| static inline int dayInMonthFromDayInYear(int dayInYear, bool leapYear) |
| { |
| const int d = dayInYear; |
| int step; |
| int next = 30; |
| |
| if (d <= next) |
| return d + 1; |
| const int daysInFeb = (leapYear ? 29 : 28); |
| if (checkMonth(d, step, next, daysInFeb)) |
| return d - step; |
| if (checkMonth(d, step, next, 31)) |
| return d - step; |
| if (checkMonth(d, step, next, 30)) |
| return d - step; |
| if (checkMonth(d, step, next, 31)) |
| return d - step; |
| if (checkMonth(d, step, next, 30)) |
| return d - step; |
| if (checkMonth(d, step, next, 31)) |
| return d - step; |
| if (checkMonth(d, step, next, 31)) |
| return d - step; |
| if (checkMonth(d, step, next, 30)) |
| return d - step; |
| if (checkMonth(d, step, next, 31)) |
| return d - step; |
| if (checkMonth(d, step, next, 30)) |
| return d - step; |
| step = next; |
| return d - step; |
| } |
| |
| static inline int monthToDayInYear(int month, bool isLeapYear) |
| { |
| return firstDayOfMonth[isLeapYear][month]; |
| } |
| |
| static inline double timeToMS(double hour, double min, double sec, double ms) |
| { |
| return (((hour * minutesPerHour + min) * secondsPerMinute + sec) * msPerSecond + ms); |
| } |
| |
| static int dateToDayInYear(int year, int month, int day) |
| { |
| year += month / 12; |
| |
| month %= 12; |
| if (month < 0) { |
| month += 12; |
| --year; |
| } |
| |
| int yearday = static_cast<int>(floor(daysFrom1970ToYear(year))); |
| int monthday = monthToDayInYear(month, isLeapYear(year)); |
| |
| return yearday + monthday + day - 1; |
| } |
| |
| double getCurrentUTCTime() |
| { |
| return floor(getCurrentUTCTimeWithMicroseconds()); |
| } |
| |
| // Returns current time in milliseconds since 1 Jan 1970. |
| double getCurrentUTCTimeWithMicroseconds() |
| { |
| return currentTime() * 1000.0; |
| } |
| |
| void getLocalTime(const time_t* localTime, struct tm* localTM) |
| { |
| #if COMPILER(MSVC7) || COMPILER(MINGW) || PLATFORM(WINCE) |
| *localTM = *localtime(localTime); |
| #elif COMPILER(MSVC) |
| localtime_s(localTM, localTime); |
| #else |
| localtime_r(localTime, localTM); |
| #endif |
| } |
| |
| // There is a hard limit at 2038 that we currently do not have a workaround |
| // for (rdar://problem/5052975). |
| static inline int maximumYearForDST() |
| { |
| return 2037; |
| } |
| |
| static inline int minimumYearForDST() |
| { |
| // Because of the 2038 issue (see maximumYearForDST) if the current year is |
| // greater than the max year minus 27 (2010), we want to use the max year |
| // minus 27 instead, to ensure there is a range of 28 years that all years |
| // can map to. |
| return std::min(msToYear(getCurrentUTCTime()), maximumYearForDST() - 27) ; |
| } |
| |
| /* |
| * Find an equivalent year for the one given, where equivalence is deterined by |
| * the two years having the same leapness and the first day of the year, falling |
| * on the same day of the week. |
| * |
| * This function returns a year between this current year and 2037, however this |
| * function will potentially return incorrect results if the current year is after |
| * 2010, (rdar://problem/5052975), if the year passed in is before 1900 or after |
| * 2100, (rdar://problem/5055038). |
| */ |
| int equivalentYearForDST(int year) |
| { |
| // It is ok if the cached year is not the current year as long as the rules |
| // for DST did not change between the two years; if they did the app would need |
| // to be restarted. |
| static int minYear = minimumYearForDST(); |
| int maxYear = maximumYearForDST(); |
| |
| int difference; |
| if (year > maxYear) |
| difference = minYear - year; |
| else if (year < minYear) |
| difference = maxYear - year; |
| else |
| return year; |
| |
| int quotient = difference / 28; |
| int product = (quotient) * 28; |
| |
| year += product; |
| ASSERT((year >= minYear && year <= maxYear) || (product - year == static_cast<int>(NaN))); |
| return year; |
| } |
| |
| static int32_t calculateUTCOffset() |
| { |
| time_t localTime = time(0); |
| tm localt; |
| getLocalTime(&localTime, &localt); |
| |
| // Get the difference between this time zone and UTC on the 1st of January of this year. |
| localt.tm_sec = 0; |
| localt.tm_min = 0; |
| localt.tm_hour = 0; |
| localt.tm_mday = 1; |
| localt.tm_mon = 0; |
| // Not setting localt.tm_year! |
| localt.tm_wday = 0; |
| localt.tm_yday = 0; |
| localt.tm_isdst = 0; |
| #if PLATFORM(WIN_OS) || PLATFORM(SOLARIS) || COMPILER(RVCT) |
| // Using a canned date of 01/01/2009 on platforms with weaker date-handling foo. |
| localt.tm_year = 109; |
| time_t utcOffset = 1230768000 - mktime(&localt); |
| #else |
| localt.tm_zone = 0; |
| localt.tm_gmtoff = 0; |
| time_t utcOffset = timegm(&localt) - mktime(&localt); |
| #endif |
| |
| return static_cast<int32_t>(utcOffset * 1000); |
| } |
| |
| #if PLATFORM(DARWIN) |
| static int32_t s_cachedUTCOffset; // In milliseconds. An assumption here is that access to an int32_t variable is atomic on platforms that take this code path. |
| static bool s_haveCachedUTCOffset; |
| static int s_notificationToken; |
| #endif |
| |
| /* |
| * Get the difference in milliseconds between this time zone and UTC (GMT) |
| * NOT including DST. |
| */ |
| double getUTCOffset() |
| { |
| #if PLATFORM(DARWIN) |
| if (s_haveCachedUTCOffset) { |
| int notified; |
| uint32_t status = notify_check(s_notificationToken, ¬ified); |
| if (status == NOTIFY_STATUS_OK && !notified) |
| return s_cachedUTCOffset; |
| } |
| #endif |
| |
| int32_t utcOffset = calculateUTCOffset(); |
| |
| #if PLATFORM(DARWIN) |
| // Theoretically, it is possible that several threads will be executing this code at once, in which case we will have a race condition, |
| // and a newer value may be overwritten. In practice, time zones don't change that often. |
| s_cachedUTCOffset = utcOffset; |
| #endif |
| |
| return utcOffset; |
| } |
| |
| /* |
| * Get the DST offset for the time passed in. Takes |
| * seconds (not milliseconds) and cannot handle dates before 1970 |
| * on some OS' |
| */ |
| static double getDSTOffsetSimple(double localTimeSeconds, double utcOffset) |
| { |
| if (localTimeSeconds > maxUnixTime) |
| localTimeSeconds = maxUnixTime; |
| else if (localTimeSeconds < 0) // Go ahead a day to make localtime work (does not work with 0) |
| localTimeSeconds += secondsPerDay; |
| |
| //input is UTC so we have to shift back to local time to determine DST thus the + getUTCOffset() |
| double offsetTime = (localTimeSeconds * msPerSecond) + utcOffset; |
| |
| // Offset from UTC but doesn't include DST obviously |
| int offsetHour = msToHours(offsetTime); |
| int offsetMinute = msToMinutes(offsetTime); |
| |
| // FIXME: time_t has a potential problem in 2038 |
| time_t localTime = static_cast<time_t>(localTimeSeconds); |
| |
| tm localTM; |
| getLocalTime(&localTime, &localTM); |
| |
| double diff = ((localTM.tm_hour - offsetHour) * secondsPerHour) + ((localTM.tm_min - offsetMinute) * 60); |
| |
| if (diff < 0) |
| diff += secondsPerDay; |
| |
| return (diff * msPerSecond); |
| } |
| |
| // Get the DST offset, given a time in UTC |
| static double getDSTOffset(double ms, double utcOffset) |
| { |
| // On Mac OS X, the call to localtime (see getDSTOffsetSimple) will return historically accurate |
| // DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript |
| // standard explicitly dictates that historical information should not be considered when |
| // determining DST. For this reason we shift away from years that localtime can handle but would |
| // return historically accurate information. |
| int year = msToYear(ms); |
| int equivalentYear = equivalentYearForDST(year); |
| if (year != equivalentYear) { |
| bool leapYear = isLeapYear(year); |
| int dayInYearLocal = dayInYear(ms, year); |
| int dayInMonth = dayInMonthFromDayInYear(dayInYearLocal, leapYear); |
| int month = monthFromDayInYear(dayInYearLocal, leapYear); |
| int day = dateToDayInYear(equivalentYear, month, dayInMonth); |
| ms = (day * msPerDay) + msToMilliseconds(ms); |
| } |
| |
| return getDSTOffsetSimple(ms / msPerSecond, utcOffset); |
| } |
| |
| double gregorianDateTimeToMS(const GregorianDateTime& t, double milliSeconds, bool inputIsUTC) |
| { |
| int day = dateToDayInYear(t.year + 1900, t.month, t.monthDay); |
| double ms = timeToMS(t.hour, t.minute, t.second, milliSeconds); |
| double result = (day * msPerDay) + ms; |
| |
| if (!inputIsUTC) { // convert to UTC |
| double utcOffset = getUTCOffset(); |
| result -= utcOffset; |
| result -= getDSTOffset(result, utcOffset); |
| } |
| |
| return result; |
| } |
| |
| void msToGregorianDateTime(double ms, bool outputIsUTC, GregorianDateTime& tm) |
| { |
| // input is UTC |
| double dstOff = 0.0; |
| const double utcOff = getUTCOffset(); |
| |
| if (!outputIsUTC) { // convert to local time |
| dstOff = getDSTOffset(ms, utcOff); |
| ms += dstOff + utcOff; |
| } |
| |
| const int year = msToYear(ms); |
| tm.second = msToSeconds(ms); |
| tm.minute = msToMinutes(ms); |
| tm.hour = msToHours(ms); |
| tm.weekDay = msToWeekDay(ms); |
| tm.yearDay = dayInYear(ms, year); |
| tm.monthDay = dayInMonthFromDayInYear(tm.yearDay, isLeapYear(year)); |
| tm.month = monthFromDayInYear(tm.yearDay, isLeapYear(year)); |
| tm.year = year - 1900; |
| tm.isDST = dstOff != 0.0; |
| |
| tm.utcOffset = outputIsUTC ? 0 : static_cast<long>((dstOff + utcOff) / msPerSecond); |
| tm.timeZone = NULL; |
| } |
| |
| void initializeDates() |
| { |
| #ifndef NDEBUG |
| static bool alreadyInitialized; |
| ASSERT(!alreadyInitialized++); |
| #endif |
| |
| equivalentYearForDST(2000); // Need to call once to initialize a static used in this function. |
| #if PLATFORM(DARWIN) |
| // Register for a notification whenever the time zone changes. |
| uint32_t status = notify_register_check("com.apple.system.timezone", &s_notificationToken); |
| if (status == NOTIFY_STATUS_OK) { |
| s_cachedUTCOffset = calculateUTCOffset(); |
| s_haveCachedUTCOffset = true; |
| } |
| #endif |
| } |
| |
| static inline double ymdhmsToSeconds(long year, int mon, int day, int hour, int minute, int second) |
| { |
| double days = (day - 32075) |
| + floor(1461 * (year + 4800.0 + (mon - 14) / 12) / 4) |
| + 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12 |
| - floor(3 * ((year + 4900.0 + (mon - 14) / 12) / 100) / 4) |
| - 2440588; |
| return ((days * hoursPerDay + hour) * minutesPerHour + minute) * secondsPerMinute + second; |
| } |
| |
| // We follow the recommendation of RFC 2822 to consider all |
| // obsolete time zones not listed here equivalent to "-0000". |
| static const struct KnownZone { |
| #if !PLATFORM(WIN_OS) |
| const |
| #endif |
| char tzName[4]; |
| int tzOffset; |
| } known_zones[] = { |
| { "UT", 0 }, |
| { "GMT", 0 }, |
| { "EST", -300 }, |
| { "EDT", -240 }, |
| { "CST", -360 }, |
| { "CDT", -300 }, |
| { "MST", -420 }, |
| { "MDT", -360 }, |
| { "PST", -480 }, |
| { "PDT", -420 } |
| }; |
| |
| inline static void skipSpacesAndComments(const char*& s) |
| { |
| int nesting = 0; |
| char ch; |
| while ((ch = *s)) { |
| if (!isASCIISpace(ch)) { |
| if (ch == '(') |
| nesting++; |
| else if (ch == ')' && nesting > 0) |
| nesting--; |
| else if (nesting == 0) |
| break; |
| } |
| s++; |
| } |
| } |
| |
| // returns 0-11 (Jan-Dec); -1 on failure |
| static int findMonth(const char* monthStr) |
| { |
| ASSERT(monthStr); |
| char needle[4]; |
| for (int i = 0; i < 3; ++i) { |
| if (!*monthStr) |
| return -1; |
| needle[i] = static_cast<char>(toASCIILower(*monthStr++)); |
| } |
| needle[3] = '\0'; |
| const char *haystack = "janfebmaraprmayjunjulaugsepoctnovdec"; |
| const char *str = strstr(haystack, needle); |
| if (str) { |
| int position = static_cast<int>(str - haystack); |
| if (position % 3 == 0) |
| return position / 3; |
| } |
| return -1; |
| } |
| |
| static bool parseLong(const char* string, char** stopPosition, int base, long* result) |
| { |
| *result = strtol(string, stopPosition, base); |
| // Avoid the use of errno as it is not available on Windows CE |
| if (string == *stopPosition || *result == LONG_MIN || *result == LONG_MAX) |
| return false; |
| return true; |
| } |
| |
| double parseDateFromNullTerminatedCharacters(const char* dateString) |
| { |
| // This parses a date in the form: |
| // Tuesday, 09-Nov-99 23:12:40 GMT |
| // or |
| // Sat, 01-Jan-2000 08:00:00 GMT |
| // or |
| // Sat, 01 Jan 2000 08:00:00 GMT |
| // or |
| // 01 Jan 99 22:00 +0100 (exceptions in rfc822/rfc2822) |
| // ### non RFC formats, added for Javascript: |
| // [Wednesday] January 09 1999 23:12:40 GMT |
| // [Wednesday] January 09 23:12:40 GMT 1999 |
| // |
| // We ignore the weekday. |
| |
| // Skip leading space |
| skipSpacesAndComments(dateString); |
| |
| long month = -1; |
| const char *wordStart = dateString; |
| // Check contents of first words if not number |
| while (*dateString && !isASCIIDigit(*dateString)) { |
| if (isASCIISpace(*dateString) || *dateString == '(') { |
| if (dateString - wordStart >= 3) |
| month = findMonth(wordStart); |
| skipSpacesAndComments(dateString); |
| wordStart = dateString; |
| } else |
| dateString++; |
| } |
| |
| // Missing delimiter between month and day (like "January29")? |
| if (month == -1 && wordStart != dateString) |
| month = findMonth(wordStart); |
| |
| skipSpacesAndComments(dateString); |
| |
| if (!*dateString) |
| return NaN; |
| |
| // ' 09-Nov-99 23:12:40 GMT' |
| char* newPosStr; |
| long day; |
| if (!parseLong(dateString, &newPosStr, 10, &day)) |
| return NaN; |
| dateString = newPosStr; |
| |
| if (!*dateString) |
| return NaN; |
| |
| if (day < 0) |
| return NaN; |
| |
| long year = 0; |
| if (day > 31) { |
| // ### where is the boundary and what happens below? |
| if (*dateString != '/') |
| return NaN; |
| // looks like a YYYY/MM/DD date |
| if (!*++dateString) |
| return NaN; |
| year = day; |
| if (!parseLong(dateString, &newPosStr, 10, &month)) |
| return NaN; |
| month -= 1; |
| dateString = newPosStr; |
| if (*dateString++ != '/' || !*dateString) |
| return NaN; |
| if (!parseLong(dateString, &newPosStr, 10, &day)) |
| return NaN; |
| dateString = newPosStr; |
| } else if (*dateString == '/' && month == -1) { |
| dateString++; |
| // This looks like a MM/DD/YYYY date, not an RFC date. |
| month = day - 1; // 0-based |
| if (!parseLong(dateString, &newPosStr, 10, &day)) |
| return NaN; |
| if (day < 1 || day > 31) |
| return NaN; |
| dateString = newPosStr; |
| if (*dateString == '/') |
| dateString++; |
| if (!*dateString) |
| return NaN; |
| } else { |
| if (*dateString == '-') |
| dateString++; |
| |
| skipSpacesAndComments(dateString); |
| |
| if (*dateString == ',') |
| dateString++; |
| |
| if (month == -1) { // not found yet |
| month = findMonth(dateString); |
| if (month == -1) |
| return NaN; |
| |
| while (*dateString && *dateString != '-' && *dateString != ',' && !isASCIISpace(*dateString)) |
| dateString++; |
| |
| if (!*dateString) |
| return NaN; |
| |
| // '-99 23:12:40 GMT' |
| if (*dateString != '-' && *dateString != '/' && *dateString != ',' && !isASCIISpace(*dateString)) |
| return NaN; |
| dateString++; |
| } |
| } |
| |
| if (month < 0 || month > 11) |
| return NaN; |
| |
| // '99 23:12:40 GMT' |
| if (year <= 0 && *dateString) { |
| if (!parseLong(dateString, &newPosStr, 10, &year)) |
| return NaN; |
| } |
| |
| // Don't fail if the time is missing. |
| long hour = 0; |
| long minute = 0; |
| long second = 0; |
| if (!*newPosStr) |
| dateString = newPosStr; |
| else { |
| // ' 23:12:40 GMT' |
| if (!(isASCIISpace(*newPosStr) || *newPosStr == ',')) { |
| if (*newPosStr != ':') |
| return NaN; |
| // There was no year; the number was the hour. |
| year = -1; |
| } else { |
| // in the normal case (we parsed the year), advance to the next number |
| dateString = ++newPosStr; |
| skipSpacesAndComments(dateString); |
| } |
| |
| parseLong(dateString, &newPosStr, 10, &hour); |
| // Do not check for errno here since we want to continue |
| // even if errno was set becasue we are still looking |
| // for the timezone! |
| |
| // Read a number? If not, this might be a timezone name. |
| if (newPosStr != dateString) { |
| dateString = newPosStr; |
| |
| if (hour < 0 || hour > 23) |
| return NaN; |
| |
| if (!*dateString) |
| return NaN; |
| |
| // ':12:40 GMT' |
| if (*dateString++ != ':') |
| return NaN; |
| |
| if (!parseLong(dateString, &newPosStr, 10, &minute)) |
| return NaN; |
| dateString = newPosStr; |
| |
| if (minute < 0 || minute > 59) |
| return NaN; |
| |
| // ':40 GMT' |
| if (*dateString && *dateString != ':' && !isASCIISpace(*dateString)) |
| return NaN; |
| |
| // seconds are optional in rfc822 + rfc2822 |
| if (*dateString ==':') { |
| dateString++; |
| |
| if (!parseLong(dateString, &newPosStr, 10, &second)) |
| return NaN; |
| dateString = newPosStr; |
| |
| if (second < 0 || second > 59) |
| return NaN; |
| } |
| |
| skipSpacesAndComments(dateString); |
| |
| if (strncasecmp(dateString, "AM", 2) == 0) { |
| if (hour > 12) |
| return NaN; |
| if (hour == 12) |
| hour = 0; |
| dateString += 2; |
| skipSpacesAndComments(dateString); |
| } else if (strncasecmp(dateString, "PM", 2) == 0) { |
| if (hour > 12) |
| return NaN; |
| if (hour != 12) |
| hour += 12; |
| dateString += 2; |
| skipSpacesAndComments(dateString); |
| } |
| } |
| } |
| |
| bool haveTZ = false; |
| int offset = 0; |
| |
| // Don't fail if the time zone is missing. |
| // Some websites omit the time zone (4275206). |
| if (*dateString) { |
| if (strncasecmp(dateString, "GMT", 3) == 0 || strncasecmp(dateString, "UTC", 3) == 0) { |
| dateString += 3; |
| haveTZ = true; |
| } |
| |
| if (*dateString == '+' || *dateString == '-') { |
| long o; |
| if (!parseLong(dateString, &newPosStr, 10, &o)) |
| return NaN; |
| dateString = newPosStr; |
| |
| if (o < -9959 || o > 9959) |
| return NaN; |
| |
| int sgn = (o < 0) ? -1 : 1; |
| o = abs(o); |
| if (*dateString != ':') { |
| offset = ((o / 100) * 60 + (o % 100)) * sgn; |
| } else { // GMT+05:00 |
| long o2; |
| if (!parseLong(dateString, &newPosStr, 10, &o2)) |
| return NaN; |
| dateString = newPosStr; |
| offset = (o * 60 + o2) * sgn; |
| } |
| haveTZ = true; |
| } else { |
| for (int i = 0; i < int(sizeof(known_zones) / sizeof(KnownZone)); i++) { |
| if (0 == strncasecmp(dateString, known_zones[i].tzName, strlen(known_zones[i].tzName))) { |
| offset = known_zones[i].tzOffset; |
| dateString += strlen(known_zones[i].tzName); |
| haveTZ = true; |
| break; |
| } |
| } |
| } |
| } |
| |
| skipSpacesAndComments(dateString); |
| |
| if (*dateString && year == -1) { |
| if (!parseLong(dateString, &newPosStr, 10, &year)) |
| return NaN; |
| dateString = newPosStr; |
| } |
| |
| skipSpacesAndComments(dateString); |
| |
| // Trailing garbage |
| if (*dateString) |
| return NaN; |
| |
| // Y2K: Handle 2 digit years. |
| if (year >= 0 && year < 100) { |
| if (year < 50) |
| year += 2000; |
| else |
| year += 1900; |
| } |
| |
| // fall back to local timezone |
| if (!haveTZ) { |
| GregorianDateTime t; |
| t.monthDay = day; |
| t.month = month; |
| t.year = year - 1900; |
| t.isDST = -1; |
| t.second = second; |
| t.minute = minute; |
| t.hour = hour; |
| |
| // Use our gregorianDateTimeToMS() rather than mktime() as the latter can't handle the full year range. |
| return gregorianDateTimeToMS(t, 0, false); |
| } |
| |
| return (ymdhmsToSeconds(year, month + 1, day, hour, minute, second) - (offset * 60.0)) * msPerSecond; |
| } |
| |
| double timeClip(double t) |
| { |
| if (!isfinite(t)) |
| return NaN; |
| if (fabs(t) > 8.64E15) |
| return NaN; |
| return trunc(t); |
| } |
| |
| |
| } // namespace WTF |
