If you want to make an admin script, you can also use WMI to run against all the computers in your domain to get this information. Here is a script from KiXomatic...

Code:

Break On
$strComputer = "."
$objWMIService = GetObject("winmgmts:\\" + $strComputer + "\root\cimv2")
$colItems = $objWMIService.ExecQuery("Select * from Win32_TimeZone",,48)
For each $objItem in $colItems
  "Bias: " + $objItem.Bias ?
  "Caption: " + $objItem.Caption ?
  "DaylightBias: " + $objItem.DaylightBias ?
  "DaylightDay: " + $objItem.DaylightDay ?
  "DaylightDayOfWeek: " + $objItem.DaylightDayOfWeek ?
  "DaylightHour: " + $objItem.DaylightHour ?
  "DaylightMillisecond: " + $objItem.DaylightMillisecond ?
  "DaylightMinute: " + $objItem.DaylightMinute ?
  "DaylightMonth: " + $objItem.DaylightMonth ?
  "DaylightName: " + $objItem.DaylightName ?
  "DaylightSecond: " + $objItem.DaylightSecond ?
  "DaylightYear: " + $objItem.DaylightYear ?
  "Description: " + $objItem.Description ?
  "SettingID: " + $objItem.SettingID ?
  "StandardBias: " + $objItem.StandardBias ?
  "StandardDay: " + $objItem.StandardDay ?
  "StandardDayOfWeek: " + $objItem.StandardDayOfWeek ?
  "StandardHour: " + $objItem.StandardHour ?
  "StandardMillisecond: " + $objItem.StandardMillisecond ?
  "StandardMinute: " + $objItem.StandardMinute ?
  "StandardMonth: " + $objItem.StandardMonth ?
  "StandardName: " + $objItem.StandardName ?
  "StandardSecond: " + $objItem.StandardSecond ?
  "StandardYear: " + $objItem.StandardYear ?
  ?
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