PHP – Convert from MySQL datetime to another format with PHP

<?php
 
$mysqlDateTime = '2016-10-17 21:46:59';
echo date("m/d/Y", strtotime($mysqlDateTime));
echo "<br>";
 
?>

<?php

$old_date = date('l, F d y h:i:s');              // returns Saturday, January 30 10 02:06:34
$old_date_timestamp = strtotime($old_date);
$new_date = date('Y-m-d H:i:s', $old_date_timestamp);
echo $new_date;
echo "<br>";

?>

<?php

$mysqlDateTime = '2016-10-17 21:46:59';
$date = strtotime($mysqlDateTime);
echo date("j F Y", $date); //output will be 10 July 2013

?>

<?php

$old_date = date('l, F d y h:i:s');
$date = new DateTime($old_date);
echo $date->format('Y-m-d H:i:s');

?>

<?php

$old_date = date('l, F d y h:i:s');
$date = date_create($old_date);
echo date_format($date, 'Y-m-d H:i:s');
echo "<br>";