- date_create_from_format: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$date = '08/2019/19 10:23:41';
echo date('Y-m-d H:i:s', strtotime($date)) . PHP_EOL;
echo date_create_from_format('m/Y/d h:i:s', $date)->format('Y-m-d H:i:s');