vivekv: I had a look at the code to AdvogatoPoster and the XML-RPC client you're using is using the DateFormat's parse method to create your Date object. This assumes that a date created locally should participate in the local timezone.

Your code will have to call setTime(Date date) on a Calendar instance and then make sure that Calendar is pointing to whatever timezone Advogato is in. Then you can use the time fields in that Calendar object to do your file processing. Details are here