A tough thing to handle man.
Qlikview do not provide any feature to access the time zone from client.
It provides the function TimeZone() , but it only takes the time zone of the server.
If you need only the server time zone that you can use ,ConvertToLocalTime() function.
I am also giving you a thread from forum related to this.
Hope it helps
Adding to Sujeet's comments,it will be very difiicult to convert the Currencies and all.Because each Currency plays major role in our application.so you have to use the separate currency conversion logic.So one application with auto feature of Currency etc will be a highly difficult task as for as my knowledge.