Time Zone Support in PHP/ MySQL Reports

I have several programs that are written in PHP/MySQL. These programs show the date and time of the fields as it is stored in the database. Now, I need to incorporate the 'Time Zone' support into these program. I am looking for a solution that does not slow down query results. Let me explain you, the server runs in California, USA and all transactions get Cailfornia datetime stamp. I have a user in East Coast (New York) which is 3 hours ahead of California. This user wants to see transactions in East Coast time zone rather than California time zone. I am looking for a solution that supports any international time zone and also, takes care of USA "daylights saving time", etc. You should provide me the solution along with a working sample program that works with PHP/MySQL environment. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Red Hat Linux.