What is the motive behind constantly changing the server time? I have had the server time move several hours about 3 times in the last few months; it certainly cannot be daylights saving time (which only occurs twice a year..).
Fortunately, I have all my scripts synchronized to my own clock in a PHP file, so I can change the timezone on all of them at once. But it's still quite a hassle and the records of older dates/times get thrown off really badly.
The server time should just stay put.. not even change for daylights saving. Otherwise, for example a forum, we might look back and see a post dated 4 am, when it was back during the time the server was many hours slower, making it actually around 12 pm.