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TimeZoneInfo.ClearCachedData Method

Clears cached time zone data.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static void ClearCachedData()

Cached time zone data includes data on the local time zone, the Coordinated Universal Time (UTC) zone, and any time zones that are retrieved by using methods such as FindSystemTimeZoneById and GetSystemTimeZones.

You might call the ClearCachedData method to reduce the memory devoted to the application's cache of time zone information or to reflect the fact that the local system's time zone has changed.

Storing references to the local and UTC time zones is not recommended. After the call to the ClearCachedData method, these object variables will be undefined TimeZoneInfo objects that are no longer references to TimeZoneInfo.Local or TimeZoneInfo.Utc. For example, in the following code, the second call to the TimeZoneInfo.ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo) method throws an ArgumentException because the local variable is no longer considered equal to TimeZoneInfo.Local.

TimeZoneInfo cst = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
TimeZoneInfo local = TimeZoneInfo.Local;
Console.WriteLine(TimeZoneInfo.ConvertTime(DateTime.Now, local, cst));

   Console.WriteLine(TimeZoneInfo.ConvertTime(DateTime.Now, local, cst));
catch (ArgumentException e)
   Console.WriteLine(e.GetType().Name + "\n   " + e.Message);

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.