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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.