transform unix timestamp in date

1=(B5/86400)+DATE(1970,1,1)

1//Our date string. The format is Y-m-d H:i:s
2$date = '2019-04-01 10:32:00';
3
4//Convert it into a Unix timestamp using strtotime.
5$timestamp = strtotime($date);
6
7//Print it out.
8echo $timestamp;