I\'m using the following INSERT statement:
INSERT INTO messages SET `to` = \'\".$to.\"\', `from` = \'\".$this->userid.\"\', `title` = \'\".$title.\"\', `m
You would want to go ahead and use the CONVERT_TZ() function in MySQL. It's based off the Olson database which your operating system uses.
CONVERT_TZ()
Here is the documentation.