Summary: DaylightSavingTA() is returning incorrect data
--- Comment #0 from Robert <koine4...@mypacks.net> 2010-10-31 05:03:33 PDT ---
DaylightSavingTA() is using the Windows API GetTimeZoneInformation() call, and
is assuming that the StandardDate and DaylightDate members of the
TIME_ZONE_INFORMATION structure are normal SYSTEMTIME values, but they are not.
ts = SYSTEMTIME2d_time(&tzi.StandardDate, dt);
td = SYSTEMTIME2d_time(&tzi.DaylightDate, dt);
if (td <= dt && dt < ts)
t = -tzi.DaylightBias * (60 * TicksPerSecond);
//printf("DST is in effect, %d\n", t);
Specifies a SYSTEMTIME structure that contains a date and local time when the
transition from standard time to daylight saving time occurs on this operating
system. If this date is not specified, the wMonth member in the SYSTEMTIME
structure must be zero. If this date is specified, the StandardDate value in
the TIME_ZONE_INFORMATION structure must also be specified.
To select the correct day in the month, set the wYear member to zero, the
wDayOfWeek member to an appropriate weekday, and the wDay member to a value in
the range 1 through 5. Using this notation, the first Sunday in April can be
specified, as can the last Thursday in October (5 is equal to "the last").
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