Retrieving Time-Zone Information

Last reviewed: September 25, 1995
Article ID: Q115231

The information in this article applies to:

Microsoft Win32 Application Programming Interface (API) included with:

    - Microsoft Windows NT versions 3.1, 3.5, and 3.51
    - Microsoft Windows 95 version 4.0

In Windows NT, version 3.1, the time-zone strings are compiled into a resource that is linked into the CONTROL.EXE file. For Windows NT, version 3.5 and later and Windows 95, the time-zone strings have been moved into the registry.

In Windows NT, the time-zone strings are located in the key:

   HKEY_LOCAL_MACHINE\SOFTWARE\
      Microsoft\
      Windows NT\
      CurrentVersion\
      Time Zones.

In Windows 95, the time-zone strings are located in the key:

   HKEY_LOCAL_MACHINE\SOFTWARE\
      Microsoft\
      Windows\
      CurrentVersion\
      Time Zones.

For each time zone, the registry key TZI is formatted as follows:

   LONG       Bias;
   LONG       StandardBias;
   LONG       DaylightBias;
   SYSTEMTIME StandardDate;
   SYSTEMTIME DaylightDate;

You can use this information to fill out a TIME_ZONE_INFORMATION structure, which is used when calling SetTimeZoneInformation().

Additional reference words: 3.50 4.00
KBCategory: kbprg
KBSubcategory: BseMisc

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Last reviewed: September 25, 1995
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