Now that the OP has clarified that it is a travelling laptop that needs to adjust to a different, local time zone, the challenge becomes clear. You need to have some way to identify that the network location is a different time zone.
You are correct, somehow I missed the part about the traveling laptops. And since TZ are machine set, they would have to be updated everytime.
I see an UDF in the near future...
_________________________
Today is the tomorrow you worried about yesterday.
