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PHP code:
echo strftime("%Y-%m-%d %X", 1236134923);


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date("Y-m-d",1236134923);



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select from_UNIXTIME(1236134923);

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$date = '2009-12-25';
$ptn = '/([\d]{4})[- \/](0?[\d]|1[0-2])[-\/ ](0?[\d]|[1-2][\d]|3[0-1])/';
if (preg_match($ptn,$date,$out))
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}
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