We had that issue as well and were told that the server's time zone is the time zone it is hosted in. Ours is hosted in California so on PST and we want to be on EST. Best way to change everyone over is doing a query update as was shown. The problem is, your scheduler still schedules at server time. example - we're on EST, server on PST which is 3 hours difference. Scheduler gets set for 7am, but runs at 10am because for the server, 7am is 10am. Three hours difference. Just keep that in mind even though you switch everyone over to "see" EST. The server still thinks in its own time.