What you describe will simply not happen.
Internally the unix timestamp is used, this does not go "backwards", it is simply converted into a display time by the software, all that will happen is these display times will change as the timezone details change. Posts will remain in order and simply display altered times.
i.e.
10:18pm User1"My Thread"
10:26pm User2"Nice Thread"
11:20pm User3"This thread is cool"
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