Александр Сизинцев

for ($h=0; $h<24; $h++) {
	for ($m=0; $m<60; $m+=5) {
		$zh = $h < 10 ? ("0" . $h) : $h;
		$zm = $m < 10 ? ("0" . $m) : $m;
		echo $zh . ":" . $zm . "\n";
	}
}

* {
box-sizing:border-box;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
}