PHP date () function formats

<?php
// Set the default time zone. Available starting with PHP 5.1
date_default_timezone_set('UTC');

// Show something like this: Monday
echo date("l");

// Show something like this: Monday 8th of August 2005 03:12:46 PM
echo date('l jS \of F Y h:i:s A');

// View: July 1, 2000 is on a Saturday
echo "July 1, 2000 is on a " . date("l", mktime(0, 0, 0, 7, 1, 2000));

/* using constants in format parameter */
// Show something like this: Wed, 25 Sep 2013 15:28:57 -0700
echo date(DATE_RFC2822);

// Show something like this: 2000-07-01T00: 00: 00 + 00: 00
echo date(DATE_ATOM, mktime(0, 0, 0, 7, 1, 2000));
?>

<?php
// Assume that today is March 10th, 2019 5:16:18 pm
// and we are in the time zone Mountain Standard Time (MST)

$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 (formatul MySQL DATETIME)
?>