Just talking through it, since threads are generally sorted by date, it'd have to change the dates in it. Easiest way I can think of (various reasons for this), would be to have the first post not able to be moved so as to use it as an anchor to base the moves off of. When posts are moved around, the dates of all posts in the thread (sans the first one, the "anchor") would be organized by the time. The post marked for # 2 would be the base time + 1 min, etc.
Keep in mind that each post in the thread after a move would need its time changed.
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