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<?php function getRoundedCutoff ($t) { $dt = new DateTime( $t ); $sec = intval($dt->format('s')); $msec = ( $sec > 30 ) ? '+'.(60-$sec) : '-'.$sec; $dt->modify($msec.' seconds'); $rmin = intval($dt->format('i')) % 15; $mmin = ( $rmin > 7 ) ? '+'.(15-$rmin) : '-'.$rmin; $dt->modify($mmin.' minutes'); return $dt->format('H:i:s'); } $times = array( '10:52:00', '10:52:59', '10:53:00', '10:50:00', '10:50:14', '10:50:59', '10:50:45', '01:12:00', '01:05:00', '01:58:00', '01:58:59', '01:59:59', '01:01:00', ); foreach ($times as $time) { var_dump($time.' -> '.getRoundedCutoff($time)); }
Output for git.master, git.master_jit, rfc.property-hooks
string(20) "10:52:00 -> 10:45:00" string(20) "10:52:59 -> 11:00:00" string(20) "10:53:00 -> 11:00:00" string(20) "10:50:00 -> 10:45:00" string(20) "10:50:14 -> 10:45:00" string(20) "10:50:59 -> 10:45:00" string(20) "10:50:45 -> 10:45:00" string(20) "01:12:00 -> 01:15:00" string(20) "01:05:00 -> 01:00:00" string(20) "01:58:00 -> 02:00:00" string(20) "01:58:59 -> 02:00:00" string(20) "01:59:59 -> 02:00:00" string(20) "01:01:00 -> 01:00:00"

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