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<?php $a = new DateTime('2015-09-01'); $b = new DateTime('2015-09-20'); $fw = $a->diff($b); $bw = $b->diff($a); echo "{$fw->days}, {$fw->d}\n"; echo "{$bw->days}, {$bw->d}\n";
Output for git.master, git.master_jit, rfc.property-hooks
19, 19 19, 19

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