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<?php $yddd = 3212; preg_match('^(\d)(\d{3})$', $yddd, $m); echo date('Y-m-d', strtotime("201{$m[1]}-01-01 00:00:00 +{$m[2]} days"));
Output for git.master, git.master_jit
Warning: preg_match(): No ending delimiter '^' found in /in/gpXG1 on line 4 Warning: Trying to access array offset on value of type null in /in/gpXG1 on line 6 Warning: Trying to access array offset on value of type null in /in/gpXG1 on line 6 1970-01-01
Output for rfc.property-hooks
Warning: preg_match(): No ending delimiter '^' found in /in/gpXG1 on line 4 Warning: Trying to access array offset on null in /in/gpXG1 on line 6 Warning: Trying to access array offset on null in /in/gpXG1 on line 6 1970-01-01

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