$today = date("F j, Y, g:i a"); // October 30, 2019, 10:42 pm
$today = date("D M j G:i:s T Y"); // Wed Oct 30 22:42:18 UTC 2019
$today = date("Y-m-d H:i:s"); // 2019-10-30 22:42:18(MySQL DATETIME format)$today = date("F j, Y, g:i a"); // March 10, 2001, 5:16 pm
$today = date("m.d.y"); // 03.10.01
$today = date("j, n, Y"); // 10, 3, 2001
$today = date("Ymd"); // 20010310
$today = date('h-i-s, j-m-y, it is w Day'); // 05-16-18, 10-03-01, 1631 1618 6 Satpm01
$today = date('\i\t \i\s \t\h\e jS \d\a\y.'); // it is the 10th day.
$today = date("D M j G:i:s T Y"); // Sat Mar 10 17:16:18 MST 2001
$today = date('H:m:s \m \i\s\ \m\o\n\t\h'); // 17:03:18 m is month
$today = date("H:i:s"); // 17:16:18
$today = date("Y-m-d H:i:s"); // 2001-03-10 17:16:18 (the MySQL DATETIME format)
<?php
// To change the format of an existing date
$old_date_format = "20/03/1999";
$new_data_format = date("Y-m-d H:i:s", strtotime($old_date_format));//Solution 1
$from = date('Y-m-d H:i a', strtotime($date_time));
echo $from;
//Solution 2
$date=date_create($date_time);
echo date_format($date,"Y/m/d H:i:s");date("d.m.Y", strtotime($mysqltimestamp)<?php
$date = '05/05/2021';
echo DateTime::createFromFormat("d/m/Y", $date)->format('Y-m-d');
//2021-05-05