Looking for Good Article/Explanation on Timezones

Hi,
I'm looking for answers about timezones and if anyone could point me to a really good artilce I'd appreciate it. Here's the type of thing I'm looking for...
I'm writing an application that creates records in a file. The records are timestamped as to their creation. The catch is that the timestamp may not be the default timezone depending on the user's preference. I know the user's UTC offset and whether they use daylight saving time. The problem comes in when trying to figure out which timezone id to use to create the new timezone and set it in the calendar object. For example, if I know that the GMT offset is -7*60*60*1000, I get back 7 possible ids. I don't know anything about the rules for daylight saving time for the user, only if they use it or not. How do I know which id to choose? The users can be from anywhere in the world.
Thanks for any help.

Yes, I'd thought about just having the user set their
timezone (similar to the forum Settings). However,
even this forum settings causes some confusion.
There's two options for a number of timezones. What
differentiates them? The daylight saving rules are
important to know and the list of timezones doesn't
indicate this in any way. This list doesn't show all
available timezones either (as previously mentionted,
there's seven timezones for GMT -0700).Then you would have to do a better job than Sun did, wouldn't you? After all if you are going to be interpreting the answer you get, you had better ask a clear question. If you want to know the list of timezones actually supported by Java, then examine the source code for the TimeZone class. You can also search Google for "time zones" for links that will keep you busy for weeks learning the arcana of time zones around the world.

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