Date time in PHP

<?php
    //If we assume year - 2020, month - March, date - 10
    $format_date = date("Y-m-d H:i:s");                   // 2020-03-10 17:16:18 (MySQL DATETIME format)
    $format_date = date("F j, Y, g:i a");                 // March 10, 2020, 5:16 pm
    $format_date = date("m.d.y");                         // 03.10.20
    $format_date = date("j, n, Y");                       // 10, 3, 2020
    $format_date = date("Ymd");                           // 20200310
    $format_date = date('h-i-s, j-m-y, it is w Day');     // 05-16-18, 10-03-20, 1631 1618 6 Satpm01
    $format_date = date('\i\t \i\s \t\h\e jS \d\a\y.');   // it is the 10th day.
    $format_date = date("D M j G:i:s T Y");               // Sat Mar 10 17:16:18 MST 2001
    $format_date = date('H:m:s \m \i\s\ \m\o\n\t\h');     // 17:03:18 m is month
    $format_date = date("H:i:s");                         // 17:16:18
?>