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<?php if (class_exists('DateTime')) { $date = (new DateTime('2013-10-31'))->modify('-1 month'); print "2013-10-31, -1 month: {$date->format('m')}"; } else { print 'Not supported.'; }
Output for git.master, git.master_jit, rfc.property-hooks
2013-10-31, -1 month: 10

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