B4J Question [ABMaterial] Get Browsers TimeZone Offset

Dim script As String = $"var d = new Date();
return d.getTimezoneOffset();"$

Dim tz As Future = page.ws.EvalWithResult(script, Null)
Log(tz.Value)

Sub GetUsertz() As Double
   
    Dim SQL As SQL = DBM.GetSQL
    Dim tzo As List = DBM.SQLSelect(SQL,"Select * FROM users WHERE UserID = "&UserID)
    Dim tz As Double =  0   
   
    If tzo.Size > 0 Then
        Dim tbl As Map = tzo.Get(0)
       
        tz  = tbl.Get("usertz")
        Dim dname As String = tbl.Get("username")
        Username = dname       
       
    End If
   
    DBM.CloseSQL(SQL)


    If tz = 0 Then ' if user timezone was not set - set it to browser tz...

        Dim script As String = $"var d = new Date();
        return d.getTimezoneOffset();"$

        Dim tzf As Future = page.ws.EvalWithResult(script, Null)
        Log(" tzf: "& (tzf.Value / 60) )   
        tz = (tzf.Value / 60) * -1  ' (420 / 60 * -1 = -7)

    End If
    Dim tzn As String = ABM.Util.GetBrowserTimeZone(page) ' returns America/Vancouver
   
    DateTime.SetTimeZone( tz)
    Main.utz = tz
    Log(" Set time zone to: "&tz&"  Name: "&tzn)
   
    Return tz
   
End Sub