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TimeZoneInfo.Id Property

.NET Framework 4

Other Versions

Gets the time zone identifier.

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

Syntax

C++

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public string Id { get; }

Property Value

Type: System.String
The time zone identifier.

Remarks

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.

Important
If you are defining a custom time zone, you should not assign it an identifier longer than 32 characters because this is the maximum length supported by the Windows registry.

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.

Examples

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

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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);

Version Information

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

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.

Reference

TimeZoneInfo Class

System Namespace

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FAQ

TimeZoneInfo Id Sample Using PowerShell

<#
.SYNOPSIS
    This script displays/Uses TimeZoneInfo properties 
.DESCRIPTION
    This script displays the use of all the TimeZoneInfo Properties.
.NOTES
    File Name  : Get-TimeZoneInfoInfo.ps1
    Author     : Thomas Lee - tfl@psp.co.uk
    Requires   : PowerShell Version 2.0
.LINK
    This script posted to:
        http://www.pshscripts.blogspot.com
    MSDN Sample posted at:
        http://msdn.microsoft.com/en-us/library/system.timezoneinfo_properties.aspx 
.EXAMPLE
    PSH [C:\foo]: .Get-TimeZoneInfoInfo.ps1'
    Time Zone: (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London
      Time zone is 0 hours 0 minutes later than Coordinated Universal Time.
      Current time is 12:22 PM on 8/28/2010 GMT Daylight Time
      Timezone id              : GMT Standard Time
      Supports Daylight Saving : True
      Daylight Saving Zone Name: GMT Daylight Time

    Time Zone: (GMT+04:30) Kabul
      Time zone is 4 hours 30 minutes later than Coordinated Universal Time.
      Current time is 12:22 PM on 8/28/2010 Afghanistan Standard Time
      Timezone id              : Afghanistan Standard Time
      Supports Daylight Saving : False
      Daylight Saving Zone Name: Afghanistan Daylight Time

    Time Zone: UTC
      Time zone is 0 hours 0 minutes later than Coordinated Universal Time.
      Current time is 12:22 PM on 8/28/2010 UTC
      Timezone id              : UTC
      Supports Daylight Saving : False
      Daylight Saving Zone Name: UTC
#>
# Display Information About Time Zones

# Get current date
$Datenow = Get-Date

# Display info re Local Time Zone
$LocalZone = [System.TimeZoneInfo]::Local
$t1 = [system.Math]::Abs($LocalZone.BaseUtcOffset.Hours)
$t2 = [System.Math]::Abs($LocalZone.BaseUtcOffset.Minutes) 
$t3 = if ($LocalZone.BaseUtcOffset -ge  [System.Timespan]::Zero) {"later"} else {"earlier"}
$t4 = if ($LocalZone.IsdaylightSavingTime($datenow)) {$Localzone.DaylightName} else {$Localzone.Standardname}
# Display information
"Time Zone: {0}" -f $Localzone.Displayname
"  Time zone is {0} hours {1} minutes {2} than Coordinated Universal Time." -f   $t1,$t2, $t3
"  Current time is {0:t} on {0:d} {1}" -f $datenow,$t4
"  Timezone id              : {0}" -f $LocalZone.Id
"  Supports Daylight Saving : {0}" -f $LocalZone.SupportsDaylightSavingTime
"  Daylight Saving Zone Name: {0}" -f $Localzone.DaylightName
""

# Get Kabul Time
$Kt = [system.TimeZoneInfo]::GetSystemTimeZones()  | ? {$_.id -match "Afghanistan Standard Time"}
$tz = $kt.Displayname
$t1 = [system.Math]::Abs($kt.BaseUtcOffset.Hours)
$t2 = [System.Math]::Abs($kt.BaseUtcOffset.Minutes) 
$t3 = if ($kt.BaseUtcOffset -ge  [System.timespan]::Zero) {"later"} else {"earlier"}
$t4 = if ($Kt.IsdaylightSavingTime($datenow)) {$Kt.DaylightName} else {$Kt.Standardname}

# Display information
"Time Zone: {0}" -f $Kt.Displayname
"  Time zone is {0} hours {1} minutes {2} than Coordinated Universal Time." -f   $t1,$t2,$t3
"  Current time is {0:t} on {0:d} {1}" -f $datenow,$t4
"  Timezone id              : {0}" -f $Kt.Id
"  Supports Daylight Saving : {0}" -f $Kt.SupportsDaylightSavingTime
"  Daylight Saving Zone Name: {0}" -f $Kt.DaylightName
""

# Display Information regarding UTC
$UtcZone = [System.TimeZoneInfo]::UTC
$t1 = [system.Math]::Abs($UtcZone.BaseUtcOffset.Hours)
$t2 = [System.Math]::Abs($UtcZone.BaseUtcOffset.Minutes) 
$t3 = if ($UtcZone.BaseUtcOffset -ge  [System.Timespan]::Zero) {"later"} else {"earlier"}
$t4 = if ($UtcZone.IsdaylightSavingTime($datenow)) {$Utczone.DaylightName} else {$UtcZone.Standardname}

# Display information
"Time Zone: {0}" -f $UtcZone.Displayname
"  Time zone is {0} hours {1} minutes {2} than Coordinated Universal Time." -f   $t1,$t2,$t3
"  Current time is {0:t} on {0:d} {1}" -f $Datenow,$t4
"  Timezone id              : {0}" -f $UtcZone.Id
"  Supports Daylight Saving : {0}" -f $UtcZone.SupportsDaylightSavingTime
"  Daylight Saving Zone Name: {0}" -f $UtcZone.DaylightName

History

8/28/2010
Thomas Lee