php strtotime timezone code example
Example 1: php get timezone
echo date_default_timezone_get(); //UTC
//Read more at https://www.php.net/manual/en/function.date-default-timezone-get.php
Example 2: php date strtotime format
$date = '25/05/2010';
$date = str_replace('/', '-', $date);
echo date('Y-m-d', strtotime($date));