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<?php $yr="2014"; $dif=2012-$yr; $week="01"; $day="Monday"; $day=date("D",strtotime($day)); echo date("Y-m-d", strtotime($yr."W".$week."D ".$day)-(86000*$dif));; echo $dif; ?>
Output for git.master, git.master_jit, rfc.property-hooks
2014-01-05-2

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