World Time Clock

PowerShell 5 comes with Get-TimeZone which returns all defined time zones and their time offset. This is all you need for a one-liner world clock:

$isSummer = (Get-Date).IsDaylightSavingTime()


Get-TimeZone -ListAvailable | ForEach-Object { 
    $dateTime = [DateTime]::UtcNow + $_.BaseUtcOffset
    $cities = $_.DisplayName.Split(')')[-1].Trim()
    if ($isSummer -and $_.SupportsDaylightSavingTime)
    {
        $dateTime = $dateTime.AddHours(1)
    }
  '{0,-30}: {1:HH:mm"h"} ({2})' -f $_.Id, $dateTime, $cities
  }

The result looks similar to this:

 
Dateline Standard Time         : 18:41h ()
UTC-11                         : 19:41h (Coordinated Universal Time-11)
Aleutian Standard Time         : 21:41h (Aleutian Islands)
Hawaiian Standard Time         : 20:41h (Hawaii)
Marquesas Standard Time        : 21:11h (Marquesas Islands)
Alaskan Standard Time          : 22:41h (Alaska)
UTC-09                         : 21:41h (Coordinated Universal Time-09)
Pacific Standard Time (Mexico) : 23:41h (Baja California)
UTC-08                         : 22:41h (Coordinated Universal Time-08)
Pacific Standard Time          : 23:41h ()
US Mountain Standard Time      : 23:41h (Arizona)
Mountain Standard Time (Mexico): 00:41h (Chihuahua, La Paz, Mazatlan)
Mountain Standard Time         : 00:41h ()
Central America Standard Time  : 00:41h (Central America)
Central Standard Time          : 01:41h ()
Easter Island Standard Time    : 01:41h (Easter Island)
Central Standard Time (Mexico) : 01:41h (Guadalajara, Mexico City, Monterrey)
Canada Central Standard Time   : 00:41h (Saskatchewan)
SA Pacific Standard Time       : 01:41h (Bogota, Lima, Quito, Rio Branco)
Eastern Standard Time (Mexico) : 02:41h (Chetumal)
Eastern Standard Time          : 02:41h ()
 

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