Detailed Time Stamps?

Is there a way to get more detailed time stamp in a post? Or can you tell me if the time stamps round up/down? I was thinking of doing a game/contest on M&G. The "Last Comment" game where you have to hold the last comment spot for X amount of time to win. I would rather remove the risk of decalring a winner falsely though because an esitmated time stamp rounded up to 8 when someone actually had 20 minutes to block; or waking up and seeing comment 9 hours ago and another 1 hour ago but not knowing if the hour rounded down.
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