GetTimeZoneInformation

The GetTimeZoneInformation function retrieves the current time-zone parameters. These parameters control the translations between Coordinated Universal Time (UTC) and local time.

DWORD GetTimeZoneInformation(

LPTIME_ZONE_INFORMATION lpTimeZoneInformation	// address of time-zone settings
);

Parameters

lpTimeZoneInformation

Points to a TIME_ZONE_INFORMATION structure to receive the current time-zone parameters.

Return Values

If the function succeeds, the return value is one of the following values:

Value	Meaning
TIME_ZONE_ID_UNKNOWN	The operating system cannot determine the current time zone. This is usually because a previous call to the SetTimeZoneInformation function supplied only the bias (and no transition dates).
TIME_ZONE_ID_STANDARD	The operating system is operating in the range covered by the StandardDate member of the structure pointed to by the lpTimeZoneInformation parameter.
TIME_ZONE_ID_DAYLIGHT	The operating system is operating in the range covered by the DaylightDate member of the structure pointed to by the lpTimeZoneInformation parameter.

If the function fails, the return value is 0xFFFFFFFF. To get extended error information, call GetLastError.

Remarks

All translations between UTC time and local time are based on the following formula:

UTC = local time + bias

The bias is the difference, in minutes, between UTC time and local time.

See Also

SetTimeZoneInformation, TIME_ZONE_INFORMATION

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