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time/Zone: add native Windows implementation

This commit is contained in:
Max Kellermann 2022-01-03 15:43:15 +01:00 committed by Max Kellermann
parent db03db0dca
commit 8333927737
1 changed files with 19 additions and 3 deletions
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22
src/time/Zone.cxx
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@ -32,19 +32,35 @@
#include "Zone.hxx"
#ifdef _WIN32
#include <profileapi.h>
#include <sysinfoapi.h>
#include <timezoneapi.h>
#else
#include <time.h>
#endif
int
GetTimeZoneOffset() noexcept
{
time_t t = 1234567890;
#ifdef _WIN32
struct tm *p = gmtime(&t);
TIME_ZONE_INFORMATION TimeZoneInformation;
DWORD tzi = GetTimeZoneInformation(&TimeZoneInformation);
int offset = -TimeZoneInformation.Bias * 60;
if (tzi == TIME_ZONE_ID_STANDARD)
offset -= TimeZoneInformation.StandardBias * 60;
if (tzi == TIME_ZONE_ID_DAYLIGHT)
offset -= TimeZoneInformation.DaylightBias * 60;
return offset;
#else
time_t t = 1234567890;
struct tm tm;
tm.tm_isdst = 0;
struct tm *p = &tm;
gmtime_r(&t, p);
#endif
return t - mktime(p);
#endif
}