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TimeZoneInfo.SupportsDaylightSavingTime Property

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

Namespace:  System
Assembly:  mscorlib (in mscorlib.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);
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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