$dt1 = new DateTime('1966-02-27 11:59:31');
$diff = $dt1->diff(new DateTime('2019-03-11 11:45:00'));
echo $diff->days.' days'."<br />";
echo $diff->y.' years'."<br />";
echo $diff->m.' months'."<br />";
echo $diff->d.' days'."<br />";
echo $diff->h.' hours'."<br />";
echo $diff->i.' minutes'."<br />";
echo $diff->s.' seconds'."<br />";
/*
run:
19369 days
53 years
0 months
11 days
23 hours
45 minutes
29 seconds
*/