TimeZoneInfo.Id Property


Gets the time zone identifier.

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

public string Id { get; }

Property Value

Type: System.String

The time zone identifier.

The time zone identifier is a key string that uniquely identifies a particular time zone. In Windows XP and Windows Vista, it corresponds to the subkeys of the HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Time Zone branch of the registry. It can be passed as a parameter to the FindSystemTimeZoneById method to retrieve a particular time zone from the registry.


Although a key name in the Windows registry can be a maximum of 255 characters, we recommend that an identifier that you assign to a custom time zone be 32 characters or fewer. The longer the identifier, the greater the probability that an incorrect key name will be supplied when retrieving it.

The value of the Id property is usually, but not always, identical to that of the StandardName property. The identifier of the Coordinated Universal Time zone is UTC.

The following example lists the identifier of each of the time zones defined on the local computer.

ReadOnlyCollection<TimeZoneInfo> zones = TimeZoneInfo.GetSystemTimeZones();
Console.WriteLine("The local system has the following {0} time zones", zones.Count);
foreach (TimeZoneInfo zone in zones)

Universal Windows Platform
Available since 10
.NET Framework
Available since 3.5
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