It will not mess up the post order cause the post still have an ID number assigned to them, so you may see a post before time was set back with a time stamp of 1:02AM and a post number of #500 and no one post till DST has taken affect and the next post is post #501 with a time stamp of 1:01AM, I have been running forums for the past 12 years and this has always been the case and it has not messed up a single time.
and time is set back at 2am not midnight, so at DST when the clock is at 1:59am then another minute goes by it will be 1:00am
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