Timestamp do Excel Unix até o momento
=(B5/86400)+DATE(1970,1,1)
Jolly Jackal
=(B5/86400)+DATE(1970,1,1)//Our date string. The format is Y-m-d H:i:s
$date = '2019-04-01 10:32:00';
//Convert it into a Unix timestamp using strtotime.
$timestamp = strtotime($date);
//Print it out.
echo $timestamp;