Online PHP editor | refs for ePTPA

<?php function getRoundedCutoff ($cutoff) { $dt = new DateTime( $cutoff ); $sec = intval($dt->format('s')); $min = intval($dt->format('i')); $rmin = $min % 15; if ( $rmin > 7 ) { $dt->add(new DateInterval('PT'.(15-$rmin).'M')); } else { $dt->sub(new DateInterval('PT'.$rmin.'M')); } $dt->sub(new DateInterval('PT'.$sec.'S')); return $dt->format('H:i:s'); } $times = array( '10:52:00', '10:52:59', '10:53:00', '10:50:00', '10:50:14', '10:50:59', '10:50:45', '01:12:00', '01:05:00', '01:58:00', '01:58:59', '01:01:00', ); foreach ($times as $time) { var_dump($time.' -> '.getRoundedCutoff($time)); }