This is likely the time difference for your server for where it is located. If you have control over it you could change its timezone to that which you require.
This will set the Hashtag with “TZ:” followed by the time offset in minutes. For instance in France where I am with daylight saving time, it is -120.
You get this value with the Session. HastagChanged event, and after a split around “TZ:” you have your user offset from UTC.
If you are familiar with Websdk you can do it more elegantly, but it goes beyond the scope of this discussion.
Sub Shown() Handles Shown
Dim JS as string
js = js + "var offset = new Date().getTimezoneOffset();"
js = js + "location.hash = 'TZ:'+offset"
self.ExecuteJavaScript(js)
End Sub