TimeZoneInfo.Id Property

Definition

Gets the time zone identifier.

public string Id { get; }

Property Value

The time zone identifier.

Examples

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)
   Console.WriteLine(zone.Id);

Remarks

The time zone identifier is a key string that uniquely identifies a particular time zone. On Windows systems, it corresponds to the subkeys of the HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Time Zone branch of the registry on Windows systems and from the ICU Library on Linux and macOS. It can be passed as a parameter to the FindSystemTimeZoneById method to instantiate a TimeZoneInfo object that represents a particular time zone.

Important

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.

Applies to

Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0