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Editorial Team
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Asked: 2026-06-12T07:23:16+00:00

The following C# code TimeZoneInfo.FindSystemTimeZoneById(foo) will throw a TimeZoneNotFoundException (as you might expect), whereas

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The following C# code

TimeZoneInfo.FindSystemTimeZoneById("foo")

will throw a TimeZoneNotFoundException (as you might expect), whereas

TimeZoneInfo.FindSystemTimeZoneById("Central European Standard Time")

correctly returns a TimeZoneInfo object for central Europe.

This is a slightly paranoid question, but does the .NET Framework guarantee that the same TimeZoneInfo instances are available on all instances of a .NET version? Do they vary by version?

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1 Answer

  1. Editorial Team

    This is based on the time zone information stored on the system itself, and is not part of the framework. From the documentation for FindSystemTimeZoneById:

    FindSystemTimeZoneById tries to match id to the subkey names of the HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Time Zones branch of the registry under Windows XP and Windows Vista. This branch does not necessarily contain a comprehensive list of time zone identifiers.

    Basically, if you’re using a time zone defined in Windows by default, it should be safe – but it is based on the system itself, not the framework.

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