#include "config.h"
#include <wtf/DateMath.h>
#include <algorithm>
#include <limits.h>
#include <limits>
#include <stdint.h>
#include <time.h>
#include <wtf/Assertions.h>
#include <wtf/ASCIICType.h>
#include <wtf/MathExtras.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringBuilder.h>
#if OS(WINDOWS)
#include <windows.h>
#endif
#if HAVE(ERRNO_H)
#include <errno.h>
#endif
#if HAVE(SYS_TIME_H)
#include <sys/time.h>
#endif
#if HAVE(SYS_TIMEB_H)
#include <sys/timeb.h>
#endif
namespace WTF {
template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const char* string, const char (&lowercaseLetters)[length])
{
return equalLettersIgnoringASCIICase(string, lowercaseLetters, length - 1);
}
static const double maxUnixTime = 2145859200.0; static const double maxECMAScriptTime = 8.64E15;
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}
};
#if !OS(WINDOWS) || HAVE(TM_GMTOFF)
static inline void getLocalTime(const time_t* localTime, struct tm* localTM)
{
#if HAVE(LOCALTIME_R)
localtime_r(localTime, localTM);
#else
localtime_s(localTime, localTM);
#endif
}
#endif
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)
{
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 - 1970.0) + yearsToAddBy4Rule - yearsToExcludeBy100Rule + yearsToAddBy400Rule;
}
double msToDays(double ms)
{
return floor(ms / msPerDay);
}
static void appendTwoDigitNumber(StringBuilder& builder, int number)
{
ASSERT(number >= 0);
ASSERT(number < 100);
builder.append(static_cast<LChar>('0' + number / 10));
builder.append(static_cast<LChar>('0' + number % 10));
}
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;
}
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;
}
int msToMinutes(double ms)
{
double result = fmod(floor(ms / msPerMinute), minutesPerHour);
if (result < 0)
result += minutesPerHour;
return static_cast<int>(result);
}
int msToHours(double ms)
{
double result = fmod(floor(ms/msPerHour), hoursPerDay);
if (result < 0)
result += hoursPerDay;
return static_cast<int>(result);
}
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);
}
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;
}
int dayInYear(int year, int month, int day)
{
return firstDayOfMonth[isLeapYear(year)][month] + day - 1;
}
double dateToDaysFrom1970(int year, int month, int day)
{
year += month / 12;
month %= 12;
if (month < 0) {
month += 12;
--year;
}
double yearday = floor(daysFrom1970ToYear(year));
ASSERT((year >= 1970 && yearday >= 0) || (year < 1970 && yearday < 0));
return yearday + dayInYear(year, month, day);
}
static inline int maximumYearForDST()
{
return 2037;
}
static inline int minimumYearForDST()
{
return std::min(msToYear(jsCurrentTime()), maximumYearForDST() - 27) ;
}
int equivalentYearForDST(int year)
{
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;
return year;
}
#if OS(WINDOWS)
typedef BOOL(WINAPI* callGetTimeZoneInformationForYear_t)(USHORT, PDYNAMIC_TIME_ZONE_INFORMATION, LPTIME_ZONE_INFORMATION);
static callGetTimeZoneInformationForYear_t timeZoneInformationForYearFunction()
{
static callGetTimeZoneInformationForYear_t getTimeZoneInformationForYear = nullptr;
if (getTimeZoneInformationForYear)
return getTimeZoneInformationForYear;
HMODULE module = ::GetModuleHandleW(L"kernel32.dll");
if (!module)
return nullptr;
getTimeZoneInformationForYear = reinterpret_cast<callGetTimeZoneInformationForYear_t>(::GetProcAddress(module, "GetTimeZoneInformationForYear"));
return getTimeZoneInformationForYear;
}
#endif
static int32_t calculateUTCOffset()
{
#if OS(WINDOWS)
TIME_ZONE_INFORMATION timeZoneInformation;
DWORD rc = 0;
if (callGetTimeZoneInformationForYear_t timeZoneFunction = timeZoneInformationForYearFunction()) {
SYSTEMTIME systemTime;
::GetSystemTime(&systemTime);
rc = timeZoneFunction(systemTime.wYear, nullptr, &timeZoneInformation);
if (rc == TIME_ZONE_ID_INVALID)
return 0;
} else {
rc = ::GetTimeZoneInformation(&timeZoneInformation);
if (rc == TIME_ZONE_ID_INVALID)
return 0;
}
int32_t bias = timeZoneInformation.Bias;
if (rc == TIME_ZONE_ID_DAYLIGHT)
bias += timeZoneInformation.DaylightBias;
else if (rc == TIME_ZONE_ID_STANDARD || rc == TIME_ZONE_ID_UNKNOWN)
bias += timeZoneInformation.StandardBias;
return -bias * 60 * 1000;
#else
time_t localTime = time(0);
tm localt;
getLocalTime(&localTime, &localt);
localt.tm_sec = 0;
localt.tm_min = 0;
localt.tm_hour = 0;
localt.tm_mday = 1;
localt.tm_mon = 0;
localt.tm_wday = 0;
localt.tm_yday = 0;
localt.tm_isdst = 0;
#if HAVE(TM_GMTOFF)
localt.tm_gmtoff = 0;
#endif
#if HAVE(TM_ZONE)
localt.tm_zone = 0;
#endif
#if HAVE(TIMEGM)
time_t utcOffset = timegm(&localt) - mktime(&localt);
#else
localt.tm_year = 109;
time_t utcOffset = 1230768000 - mktime(&localt);
#endif
return static_cast<int32_t>(utcOffset * 1000);
#endif
}
#if !HAVE(TM_GMTOFF)
#if OS(WINDOWS)
static void UnixTimeToFileTime(time_t t, LPFILETIME pft)
{
LONGLONG ll;
ll = Int32x32To64(t, 10000000) + 116444736000000000;
pft->dwLowDateTime = (DWORD)ll;
pft->dwHighDateTime = ll >> 32;
}
#endif
static double calculateDSTOffset(time_t localTime, double utcOffset)
{
double offsetTime = (localTime * msPerSecond) + utcOffset;
int offsetHour = msToHours(offsetTime);
int offsetMinute = msToMinutes(offsetTime);
#if OS(WINDOWS)
FILETIME utcFileTime;
UnixTimeToFileTime(localTime, &utcFileTime);
SYSTEMTIME utcSystemTime, localSystemTime;
if (!::FileTimeToSystemTime(&utcFileTime, &utcSystemTime))
return 0;
if (!::SystemTimeToTzSpecificLocalTime(nullptr, &utcSystemTime, &localSystemTime))
return 0;
double diff = ((localSystemTime.wHour - offsetHour) * secondsPerHour) + ((localSystemTime.wMinute - offsetMinute) * 60);
#else
tm localTM;
getLocalTime(&localTime, &localTM);
double diff = ((localTM.tm_hour - offsetHour) * secondsPerHour) + ((localTM.tm_min - offsetMinute) * 60);
#endif
if (diff < 0)
diff += secondsPerDay;
return (diff * msPerSecond);
}
#endif
LocalTimeOffset calculateLocalTimeOffset(double ms, TimeType inputTimeType)
{
#if HAVE(TM_GMTOFF)
double localToUTCTimeOffset = inputTimeType == LocalTime ? calculateUTCOffset() : 0;
#else
double localToUTCTimeOffset = calculateUTCOffset();
#endif
if (inputTimeType == LocalTime)
ms -= localToUTCTimeOffset;
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);
double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);
ms = (day * msPerDay) + msToMilliseconds(ms);
}
double localTimeSeconds = ms / msPerSecond;
if (localTimeSeconds > maxUnixTime)
localTimeSeconds = maxUnixTime;
else if (localTimeSeconds < 0) localTimeSeconds += secondsPerDay;
time_t localTime = static_cast<time_t>(localTimeSeconds);
#if HAVE(TM_GMTOFF)
tm localTM;
getLocalTime(&localTime, &localTM);
return LocalTimeOffset(localTM.tm_isdst, localTM.tm_gmtoff * msPerSecond);
#else
double dstOffset = calculateDSTOffset(localTime, localToUTCTimeOffset);
return LocalTimeOffset(dstOffset, localToUTCTimeOffset + dstOffset);
#endif
}
void initializeDates()
{
#if !ASSERT_DISABLED
static bool alreadyInitialized;
ASSERT(!alreadyInitialized);
alreadyInitialized = true;
#endif
equivalentYearForDST(2000); }
static inline double ymdhmsToSeconds(int year, long mon, long day, long hour, long minute, double second)
{
int mday = firstDayOfMonth[isLeapYear(year)][mon - 1];
double ydays = daysFrom1970ToYear(year);
double dateSeconds = second + minute * secondsPerMinute + hour * secondsPerHour + (mday + day - 1 + ydays) * secondsPerDay;
if (dateSeconds < -8640000000000.0 || dateSeconds > 8640000000000.0)
return std::numeric_limits<double>::quiet_NaN();
return dateSeconds;
}
static const struct KnownZone {
#if !OS(WINDOWS)
const
#endif
char tzName[4];
int tzOffset;
} knownZones[] = {
{ "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++;
}
}
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 parseInt(const char* string, char** stopPosition, int base, int* result)
{
long longResult = strtol(string, stopPosition, base);
if (string == *stopPosition || longResult <= std::numeric_limits<int>::min() || longResult >= std::numeric_limits<int>::max())
return false;
*result = static_cast<int>(longResult);
return true;
}
static bool parseLong(const char* string, char** stopPosition, int base, long* result)
{
*result = strtol(string, stopPosition, base);
if (string == *stopPosition || *result == std::numeric_limits<long>::min() || *result == std::numeric_limits<long>::max())
return false;
return true;
}
static char* parseES5DatePortion(const char* currentPosition, int& year, long& month, long& day)
{
char* postParsePosition;
if (!parseInt(currentPosition, &postParsePosition, 10, &year))
return 0;
if (*postParsePosition != '-')
return postParsePosition;
currentPosition = postParsePosition + 1;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &month))
return 0;
if ((postParsePosition - currentPosition) != 2)
return 0;
if (*postParsePosition != '-')
return postParsePosition;
currentPosition = postParsePosition + 1;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &day))
return 0;
if ((postParsePosition - currentPosition) != 2)
return 0;
return postParsePosition;
}
static char* parseES5TimePortion(char* currentPosition, long& hours, long& minutes, double& seconds, long& timeZoneSeconds)
{
char* postParsePosition;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &hours))
return 0;
if (*postParsePosition != ':' || (postParsePosition - currentPosition) != 2)
return 0;
currentPosition = postParsePosition + 1;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &minutes))
return 0;
if ((postParsePosition - currentPosition) != 2)
return 0;
currentPosition = postParsePosition;
if (*currentPosition == ':') {
++currentPosition;
long intSeconds;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &intSeconds))
return 0;
if ((postParsePosition - currentPosition) != 2)
return 0;
seconds = intSeconds;
if (*postParsePosition == '.') {
currentPosition = postParsePosition + 1;
if (!isASCIIDigit(*currentPosition))
return 0;
long fracSeconds;
if (!parseLong(currentPosition, &postParsePosition, 10, &fracSeconds))
return 0;
long numFracDigits = postParsePosition - currentPosition;
seconds += fracSeconds * pow(10.0, static_cast<double>(-numFracDigits));
}
currentPosition = postParsePosition;
}
if (*currentPosition == 'Z')
return currentPosition + 1;
bool tzNegative;
if (*currentPosition == '-')
tzNegative = true;
else if (*currentPosition == '+')
tzNegative = false;
else
return currentPosition; ++currentPosition;
long tzHours;
long tzHoursAbs;
long tzMinutes;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &tzHours))
return 0;
if (*postParsePosition != ':' || (postParsePosition - currentPosition) != 2)
return 0;
tzHoursAbs = labs(tzHours);
currentPosition = postParsePosition + 1;
if (!isASCIIDigit(*currentPosition))
return 0;
if (!parseLong(currentPosition, &postParsePosition, 10, &tzMinutes))
return 0;
if ((postParsePosition - currentPosition) != 2)
return 0;
currentPosition = postParsePosition;
if (tzHoursAbs > 24)
return 0;
if (tzMinutes < 0 || tzMinutes > 59)
return 0;
timeZoneSeconds = 60 * (tzMinutes + (60 * tzHoursAbs));
if (tzNegative)
timeZoneSeconds = -timeZoneSeconds;
return currentPosition;
}
double parseES5DateFromNullTerminatedCharacters(const char* dateString)
{
static const long daysPerMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int year = 0;
long month = 1;
long day = 1;
long hours = 0;
long minutes = 0;
double seconds = 0;
long timeZoneSeconds = 0;
char* currentPosition = parseES5DatePortion(dateString, year, month, day);
if (!currentPosition)
return std::numeric_limits<double>::quiet_NaN();
if (*currentPosition == 'T') {
currentPosition = parseES5TimePortion(currentPosition + 1, hours, minutes, seconds, timeZoneSeconds);
if (!currentPosition)
return std::numeric_limits<double>::quiet_NaN();
}
if (*currentPosition)
return std::numeric_limits<double>::quiet_NaN();
if (month < 1 || month > 12)
return std::numeric_limits<double>::quiet_NaN();
if (day < 1 || day > daysPerMonth[month - 1])
return std::numeric_limits<double>::quiet_NaN();
if (month == 2 && day > 28 && !isLeapYear(year))
return std::numeric_limits<double>::quiet_NaN();
if (hours < 0 || hours > 24)
return std::numeric_limits<double>::quiet_NaN();
if (hours == 24 && (minutes || seconds))
return std::numeric_limits<double>::quiet_NaN();
if (minutes < 0 || minutes > 59)
return std::numeric_limits<double>::quiet_NaN();
if (seconds < 0 || seconds >= 61)
return std::numeric_limits<double>::quiet_NaN();
if (seconds > 60) {
seconds = 60;
}
double dateSeconds = ymdhmsToSeconds(year, month, day, hours, minutes, seconds) - timeZoneSeconds;
return dateSeconds * msPerSecond;
}
double parseDateFromNullTerminatedCharacters(const char* dateString, bool& haveTZ, int& offset)
{
haveTZ = false;
offset = 0;
skipSpacesAndComments(dateString);
long month = -1;
const char *wordStart = dateString;
while (*dateString && !isASCIIDigit(*dateString)) {
if (isASCIISpace(*dateString) || *dateString == '(') {
if (dateString - wordStart >= 3)
month = findMonth(wordStart);
skipSpacesAndComments(dateString);
wordStart = dateString;
} else
dateString++;
}
if (month == -1 && wordStart != dateString)
month = findMonth(wordStart);
skipSpacesAndComments(dateString);
if (!*dateString)
return std::numeric_limits<double>::quiet_NaN();
char* newPosStr;
long day;
if (!parseLong(dateString, &newPosStr, 10, &day))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
if (day < 0)
return std::numeric_limits<double>::quiet_NaN();
Optional<int> year;
if (day > 31) {
if (*dateString != '/')
return std::numeric_limits<double>::quiet_NaN();
if (!*++dateString)
return std::numeric_limits<double>::quiet_NaN();
if (day <= std::numeric_limits<int>::min() || day >= std::numeric_limits<int>::max())
return std::numeric_limits<double>::quiet_NaN();
year = static_cast<int>(day);
if (!parseLong(dateString, &newPosStr, 10, &month))
return std::numeric_limits<double>::quiet_NaN();
month -= 1;
dateString = newPosStr;
if (*dateString++ != '/' || !*dateString)
return std::numeric_limits<double>::quiet_NaN();
if (!parseLong(dateString, &newPosStr, 10, &day))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
} else if (*dateString == '/' && month == -1) {
dateString++;
month = day - 1; if (!parseLong(dateString, &newPosStr, 10, &day))
return std::numeric_limits<double>::quiet_NaN();
if (day < 1 || day > 31)
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
if (*dateString == '/')
dateString++;
if (!*dateString)
return std::numeric_limits<double>::quiet_NaN();
} else {
if (*dateString == '-')
dateString++;
skipSpacesAndComments(dateString);
if (*dateString == ',')
dateString++;
if (month == -1) { month = findMonth(dateString);
if (month == -1)
return std::numeric_limits<double>::quiet_NaN();
while (*dateString && *dateString != '-' && *dateString != ',' && !isASCIISpace(*dateString))
dateString++;
if (!*dateString)
return std::numeric_limits<double>::quiet_NaN();
if (*dateString != '-' && *dateString != '/' && *dateString != ',' && !isASCIISpace(*dateString))
return std::numeric_limits<double>::quiet_NaN();
dateString++;
}
}
if (month < 0 || month > 11)
return std::numeric_limits<double>::quiet_NaN();
if (*dateString && !year) {
int result = 0;
if (!parseInt(dateString, &newPosStr, 10, &result))
return std::numeric_limits<double>::quiet_NaN();
year = result;
}
long hour = 0;
long minute = 0;
long second = 0;
if (!*newPosStr)
dateString = newPosStr;
else {
if (!(isASCIISpace(*newPosStr) || *newPosStr == ',')) {
if (*newPosStr != ':')
return std::numeric_limits<double>::quiet_NaN();
year = WTF::nullopt;
} else {
dateString = ++newPosStr;
skipSpacesAndComments(dateString);
}
parseLong(dateString, &newPosStr, 10, &hour);
if (newPosStr != dateString) {
dateString = newPosStr;
if (hour < 0 || hour > 23)
return std::numeric_limits<double>::quiet_NaN();
if (!*dateString)
return std::numeric_limits<double>::quiet_NaN();
if (*dateString++ != ':')
return std::numeric_limits<double>::quiet_NaN();
if (!parseLong(dateString, &newPosStr, 10, &minute))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
if (minute < 0 || minute > 59)
return std::numeric_limits<double>::quiet_NaN();
if (*dateString && *dateString != ':' && !isASCIISpace(*dateString))
return std::numeric_limits<double>::quiet_NaN();
if (*dateString ==':') {
dateString++;
if (!parseLong(dateString, &newPosStr, 10, &second))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
if (second < 0 || second > 59)
return std::numeric_limits<double>::quiet_NaN();
}
skipSpacesAndComments(dateString);
if (startsWithLettersIgnoringASCIICase(dateString, "am")) {
if (hour > 12)
return std::numeric_limits<double>::quiet_NaN();
if (hour == 12)
hour = 0;
dateString += 2;
skipSpacesAndComments(dateString);
} else if (startsWithLettersIgnoringASCIICase(dateString, "pm")) {
if (hour > 12)
return std::numeric_limits<double>::quiet_NaN();
if (hour != 12)
hour += 12;
dateString += 2;
skipSpacesAndComments(dateString);
}
}
}
if (isASCIIDigit(*dateString) && !year) {
int result = 0;
if (!parseInt(dateString, &newPosStr, 10, &result))
return std::numeric_limits<double>::quiet_NaN();
year = result;
dateString = newPosStr;
skipSpacesAndComments(dateString);
}
if (*dateString) {
if (startsWithLettersIgnoringASCIICase(dateString, "gmt") || startsWithLettersIgnoringASCIICase(dateString, "utc")) {
dateString += 3;
haveTZ = true;
}
if (*dateString == '+' || *dateString == '-') {
int o;
if (!parseInt(dateString, &newPosStr, 10, &o))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
if (o < -9959 || o > 9959)
return std::numeric_limits<double>::quiet_NaN();
int sgn = (o < 0) ? -1 : 1;
o = abs(o);
if (*dateString != ':') {
if (o >= 24)
offset = ((o / 100) * 60 + (o % 100)) * sgn;
else
offset = o * 60 * sgn;
} else { ++dateString; int o2;
if (!parseInt(dateString, &newPosStr, 10, &o2))
return std::numeric_limits<double>::quiet_NaN();
dateString = newPosStr;
offset = (o * 60 + o2) * sgn;
}
haveTZ = true;
} else {
for (auto& knownZone : knownZones) {
auto length = strlen(knownZone.tzName);
if (equalLettersIgnoringASCIICase(dateString, knownZone.tzName, length)) {
offset = knownZone.tzOffset;
dateString += length;
haveTZ = true;
break;
}
}
}
}
skipSpacesAndComments(dateString);
if (*dateString && !year) {
int result = 0;
if (!parseInt(dateString, &newPosStr, 10, &result))
return std::numeric_limits<double>::quiet_NaN();
year = result;
dateString = newPosStr;
skipSpacesAndComments(dateString);
}
if (*dateString)
return std::numeric_limits<double>::quiet_NaN();
if (year) {
int yearValue = year.value();
if (yearValue >= 0 && yearValue < 100) {
if (yearValue < 50)
yearValue += 2000;
else
yearValue += 1900;
}
year = yearValue;
} else {
year = 2000;
}
ASSERT(year);
return ymdhmsToSeconds(year.value(), month + 1, day, hour, minute, second) * msPerSecond;
}
double parseDateFromNullTerminatedCharacters(const char* dateString)
{
bool haveTZ;
int offset;
double ms = parseDateFromNullTerminatedCharacters(dateString, haveTZ, offset);
if (std::isnan(ms))
return std::numeric_limits<double>::quiet_NaN();
if (!haveTZ)
offset = calculateLocalTimeOffset(ms, LocalTime).offset / msPerMinute;
return ms - (offset * msPerMinute);
}
double timeClip(double t)
{
if (std::abs(t) > maxECMAScriptTime)
return std::numeric_limits<double>::quiet_NaN();
return std::trunc(t) + 0.0;
}
String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, unsigned year, unsigned hours, unsigned minutes, unsigned seconds, int utcOffset)
{
StringBuilder stringBuilder;
stringBuilder.append(weekdayName[dayOfWeek]);
stringBuilder.appendLiteral(", ");
stringBuilder.appendNumber(day);
stringBuilder.append(' ');
stringBuilder.append(monthName[month]);
stringBuilder.append(' ');
stringBuilder.appendNumber(year);
stringBuilder.append(' ');
appendTwoDigitNumber(stringBuilder, hours);
stringBuilder.append(':');
appendTwoDigitNumber(stringBuilder, minutes);
stringBuilder.append(':');
appendTwoDigitNumber(stringBuilder, seconds);
stringBuilder.append(' ');
stringBuilder.append(utcOffset > 0 ? '+' : '-');
int absoluteUTCOffset = abs(utcOffset);
appendTwoDigitNumber(stringBuilder, absoluteUTCOffset / 60);
appendTwoDigitNumber(stringBuilder, absoluteUTCOffset % 60);
return stringBuilder.toString();
}
}