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I will explain this by example:

When I ask a question at 21:00 and look in my profile 21 hours later it still says that I've asked the question today instead of yesterday.

Shouldn't this be just yesterday?

It's a minor detail but it's there.

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marked as duplicate by Martijn Pieters, ben is uǝq backwards, Yannis, Bo Persson, Nicol Bolas Mar 20 '13 at 12:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

UTC versus local time; I'm sure this is a duplicate, btw. – Martijn Pieters Mar 20 '13 at 12:25
I will remove this then – MmynameStackflow Mar 20 '13 at 12:30
@MmynameStackflow, Even Yesterday is not yesterday – Raynold Mar 20 '13 at 12:35
up vote 2 down vote accepted

It is because of everything on the site is calculated/act on UTC Time Zone basis. StackOverflow is using all over the world with the different different time zones, so rather than maintaining personalized timezone, UTC Timezone is the best way.

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Allright I understand, but isn't there a better way to do this because stackoverflow is used by almost the whole world. – MmynameStackflow Mar 20 '13 at 12:29
Given the fact that it is used by the whole world is exactly why UTC is the appropriate method. – psubsee2003 Mar 20 '13 at 12:30
@MmynameStackflow: "Day" is a construct based on one's personal location on the Earth. Therefore, everyone has a different notion of "today". SO picks a single, specific standard, because you have to pick something. Not unsurprisingly, they pick the standard for international dates and times as their time standard. – Nicol Bolas Mar 20 '13 at 12:39
@MmynameStackflow The U in UTC stands for universal. – Mike B Mar 20 '13 at 12:48

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