Евгений

server {
	listen   80 default;
	access_log off;
  
	location / {
		return 444;
	}
}

<?php
$begin = new DateTime('2015-01-20');
$end = new DateTime('2015-01-21');

$interval = DateInterval::createFromDateString('+ 5 minute');
$period = new DatePeriod($begin, $interval, $end);

foreach ($period as $dt) {
    echo $dt->format("Y-m-d H:i:s"), "\n";
}