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<?php $a = new DateTime('2015-1-31'); $b = new DateTime('2015-2-1'); $a->add(new DateInterval('P1M')); echo $a->format('Y-m-d'); echo date('Y-m-d', strtotime('+1 month', strtotime('2015-1-31'))); echo $a < $b ? 'ja' : 'nein';
Output for git.master, git.master_jit, rfc.property-hooks
2015-03-032015-03-03nein

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