This documentation is archived and is not being maintained.

TimeZoneInfo.SupportsDaylightSavingTime Property

Gets a value indicating whether the time zone has any daylight saving time rules.

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

public bool SupportsDaylightSavingTime { get; }

Property Value

Type: System.Boolean
true if the time zone supports daylight saving time; otherwise, false.

The value of the SupportsDaylightSavingTime property for the local time zone returned by the TimeZoneInfo.Local property reflects the setting of the Control Panel Date and Time application's checkbox that defines whether the system automatically adjusts for daylight saving time. If it is unchecked, or if no checkbox is displayed for a time zone, the value of this property is false.

The following example retrieves a collection of all time zones that are available on a local system and displays the names of those that do not support daylight saving time.

ReadOnlyCollection<TimeZoneInfo> zones = TimeZoneInfo.GetSystemTimeZones();
foreach(TimeZoneInfo zone in zones)
{
   if (! zone.SupportsDaylightSavingTime)
      Console.WriteLine(zone.DisplayName);
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5
Show: