If you are actively working with a Bugzilla 4.2 server, where data is actively modified (there are many changes), it is recommended to explicitly specify the server time zone in Deskzilla. Otherwise Deskzilla might be downloading more information than necessary during synchronization (depending on the server time zone).
...
To let Deskzilla know the server time zone, please go to Tools | System Properties and add bugzillaadd bugzilla.request.date.zone parameter with the value in the following format: GMT GMT-XXXX or GMT+XXXX.
For example for PDT it will be GMT-0700.
...