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<?php function getRoundedCutoff ($t) { $time = explode(':', $t); if ( $time[2] > 30 ) { $time[1] = intval($time[1]) + 1; } if ( $time[1] >= 60 ) { $time[1] = '00'; $time[0] = $time[0] + 1; } $time[2] = '00'; $rmin = $time[1] % 15; $dt = new DateTime( implode(':', $time) ); if ( $rmin > 7 ) { $dt->add(new DateInterval('PT'.(15-$rmin).'M')); } else { $dt->sub(new DateInterval('PT'.$rmin.'M')); } 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)); }

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