Autohotkey RFC3339 datetime with timezone

time.ahk

/* 
Usage:
timeStr := Get_now()
MsgBox, %timeStr
*/

Get_now()
{
    global
    UTCFormatStr := "yyyy-MM-dd'T'HH:mm:ss"
    FormatTime, TimeStr, CurrentDateTime, %UTCFormatStr%
    T1 := A_Now
    T2 := A_NowUTC
    EnvSub, T1, %T2%, M
    TZD := Round( T1/60, 0 ) 
    if (TZD == "0") {
      return Format("{}Z", TimeStr)
    } else if (TZD < 0) {
    return Format("{}-{2:02}:00", TimeStr, -TZD )
    } else {
    return Format("{}+{2:02}:00", TimeStr, TZD )
    }
}

;Ctrl + Shift + D to add date time
^+d::
    FormatTime, CurrentDateTime, , dd/MM/yyyy
    SendInput %CurrentDateTime%
return