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See the transcript here:

hmmmmm

And the actual timestamps here:

odd...

Why do they differ?

For one thing the transcript version is in 12 Hour and and the chatroom is in 24 Hour mode.
And the other is that the transcript is 5 hours ahead of the chatroom.
How is that possible?

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2 Answers

The transcript isn't 5 hours ahead of the chatroom, your timezone is 5 hours behind the UTC timestamps that all of Stack Exchange uses, including chat transcripts. Chat messages can be displayed in your timezone because chat uses Javascript to calculate the time difference between your system time and the server's time, and adjusts the time of incoming messages

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Ok what about the 12HR vs 24HR formats? –  amanaP lanaC A nalP A naM A Dec 15 '11 at 19:44
    
It is most likely a usability thing. When the chatroom is live, you obviously know if it is light or dark out. But if you are looking at the transcript from a month ago, corrected to GMT, having the 24 hour format is better. –  Zoredache Dec 15 '11 at 19:45
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@amanaP: Not everyone around the world uses 12HR format. –  animuson Dec 15 '11 at 19:46
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Oy... but the 12hr stamps are on the UTC timestamps, not on the local timestamps.... –  amanaP lanaC A nalP A naM A Dec 15 '11 at 19:56
    
@amanaPlanaCAnalPAnaMA Oh, they are. I have no idea then; I suspect they did it accidentally –  Michael Mrozek Dec 15 '11 at 20:08
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The transcript is in GMT, and you must be have a local time that is 5 hours different. Which would make sence since EST happens to be -5 hours.

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Ok what about the 12HR vs 24HR formats? –  amanaP lanaC A nalP A naM A Dec 15 '11 at 19:44
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