Need to use unix TZ timezone strings in java Timezone class

Hi, We have an application that uses the unix timezone string formats "EST5EDT", "PST8PDT" etc. I need to convert these timezone strings into equivalent java timezones that can be understood by java.util.TimeZone class. If I pass the above unix timezone strings, it returns the server timezone and not the java equivalent of the unix timezone. I would appreciate any help in resolving this. Thanks, Preeti