The script shows the offset from GMT-UTC in standard format through string manipulation.
#include <Date.au3>
ConsoleWrite (_TimeZoneInfo() & @CRLF)
Func _TimeZoneInfo()
$aInfo = _Date_Time_GetTimeZoneInformation()
ConsoleWrite("bias: " & $aInfo[1] & @CRLF)
$hours = $aInfo[1] / 60
If $hours = "0" Then
$hours = "+00:00"
Else
If StringInStr($hours, "-") Then
$hours = StringReplace($hours, "-", "+")
Else
$hours = "-" & $hours
EndIf
If Not StringInStr($hours, "