gmdate - 초(second)를 시분초로 변환

(PHP 4, PHP 5, PHP 7, PHP 8)

gmdate — Format a GMT/UTC date/time

gmdate(string $format, ?int $timestamp = null): string

<?php

echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));

echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));

?>

<?php

$running_time = "215";

$running_gmdate_time = gmdate('H:i:s', $running_time);

echo $running_gmdate_time; //00:03:35

?>