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Windows: use SystemTimeToTzSpecificLocalTime instead of localtime_s.

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The localtime_s function produces incorrect results for russian time zone.

BUG=chromium:417640
LOG=Y
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/654843012

Cr-Commit-Position: refs/heads/master@{#24922}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
ulan@chromium.org 2014-10-28 08:55:28 +00:00
parent f118921e3b
commit 2b26c7a144
1 changed files with 14 additions and 29 deletions
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43
src/base/platform/platform-win32.cc
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@ -346,41 +346,26 @@ void Win32Time::SetToCurrentTime() {
}
int64_t FileTimeToInt64(FILETIME ft) {
ULARGE_INTEGER result;
result.LowPart = ft.dwLowDateTime;
result.HighPart = ft.dwHighDateTime;
return static_cast<int64_t>(result.QuadPart);
}
// Return the local timezone offset in milliseconds east of UTC. This
// takes into account whether daylight saving is in effect at the time.
// Only times in the 32-bit Unix range may be passed to this function.
// Also, adding the time-zone offset to the input must not overflow.
// The function EquivalentTime() in date.js guarantees this.
int64_t Win32Time::LocalOffset(TimezoneCache* cache) {
cache->InitializeIfNeeded();
Win32Time rounded_to_second(*this);
rounded_to_second.t() = rounded_to_second.t() / 1000 / kTimeScaler *
1000 * kTimeScaler;
// Convert to local time using POSIX localtime function.
// Windows XP Service Pack 3 made SystemTimeToTzSpecificLocalTime()
// very slow. Other browsers use localtime().
// Convert from JavaScript milliseconds past 1/1/1970 0:00:00 to
// POSIX seconds past 1/1/1970 0:00:00.
double unchecked_posix_time = rounded_to_second.ToJSTime() / 1000;
if (unchecked_posix_time > INT_MAX || unchecked_posix_time < 0) {
return 0;
}
// Because _USE_32BIT_TIME_T is defined, time_t is a 32-bit int.
time_t posix_time = static_cast<time_t>(unchecked_posix_time);
// Convert to local time, as struct with fields for day, hour, year, etc.
tm posix_local_time_struct;
if (localtime_s(&posix_local_time_struct, &posix_time)) return 0;
if (posix_local_time_struct.tm_isdst > 0) {
return (cache->tzinfo_.Bias + cache->tzinfo_.DaylightBias) * -kMsPerMinute;
} else if (posix_local_time_struct.tm_isdst == 0) {
return (cache->tzinfo_.Bias + cache->tzinfo_.StandardBias) * -kMsPerMinute;
} else {
return cache->tzinfo_.Bias * -kMsPerMinute;
}
FILETIME local;
SYSTEMTIME system_utc, system_local;
FileTimeToSystemTime(&time_.ft_, &system_utc);
SystemTimeToTzSpecificLocalTime(NULL, &system_utc, &system_local);
SystemTimeToFileTime(&system_local, &local);
return (FileTimeToInt64(local) - FileTimeToInt64(time_.ft_)) / kTimeScaler;
}