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Get windows time zone

Posted on 1998-08-30
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Last Modified: 2010-04-16
How can I get the time zone set on a PC.
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Question by:moonrise
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ZifNab earned 30 total points
ID: 1338140
hi moonrise :

>HKEYLocal Machine/Software/Microsoft/Windows/CurrentVersion/TimeZones/
>
>is the place where Timezone infos are stored in the registry. The
>binary 'TZI' entry should be the info for start and end times of
>daylight saving times. Anyone has an idea how to extract the dates
>from this value?
>

The TZI entry seems to be structured as follows:

int32 Bias;             // Minutes from GMT
                        // (Sydney -600; 0xfffffda8;
                        // or a8, fd, ff, ff)
int32 StandardBias;     // Bias for Standard time (0)
int32 DaylightBias;     // Bias for Daylight time (-60
                        // or 0xffffffc4 )
int16 ??                          // 0
int16 StandardStartMonth;         // 3 => March
int16 StandardStartDayOfWeek??;   // 0 => Sun
int16 StandardStartDOWoccurrence; // 1 => 1st
int16 StandardStartHour;          // 2 => 02:00:00.00
int16 StandardStartMins??;        // 0 => 02:00:00.00
int16 StandardStartSecs??;        // 0 => 02:00:00.00
int16 StandardStartHunds??;       // 0 => 02:00:00.00
int16 ??                          // 0
int16 DaylightStartMonth;         // 0x0a (10) => October
int16 DaylightStartDayOfWeek??;   // 0 => Sun
int16 DaylightStartDOWoccurrence; // 5 => last
int16 DaylightStartHour;          // 2 => 02:00:00.00
int16 DaylightStartMins??;        // 0 => 02:00:00.00
int16 DaylightStartSecs??;        // 0 => 02:00:00.00
int16 DaylightStartHunds??;       // 0 => 02:00:00.00

or use the GetTimeZoneInformation() Api.

The constants for the return values for the Windows API function GetTimeZoneInformation() are

const TIME_ZONE_ID_UNKNOWN  =  0;
const TIME_ZONE_ID_STANDARD =  1;
const TIME_ZONE_ID_DAYLIGHT =  2;


Regards, Zif.
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