$dt = new DateTime('03/17/2022'); // MM/DD/YYYY
echo $dt->format('Y-m-d H:i:s') . "\n";
echo $dt->format('r') . "\n";
echo $dt->format('M/d/Y') . "\n";
echo $dt->format('d-m-Y') . "\n";
/*
run:
2022-03-17 00:00:00
Thu, 17 Mar 2022 00:00:00 +0000
Mar/17/2022
17-03-2022
*/