php date format yyyy-mm-dd code example

Example 1: php date format dd/mm/yyyy

date("d/m/Y", strtotime($str));

Example 2: php convert date from dd/mm/yyyy to yyyy-mm-dd

$date = DateTime::createFromFormat('d/m/Y', "24/04/2012");
echo $date->format('Y-m-d');

Example 3: php validate date format yyyy-mm-dd

$date="2012-09-12";

if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/",$date)) {
    return true;
} else {
    return false;
}

Example 4: yyyymmdd to yyyy-mm-dd php

<?php
// both lines output 813470400
echo strtotime("19951012"), "\n",
     strtotime("12 October 1995");

// prints 1995 Oct 12
echo date("Y-m-d", strtotime("19951012"));
?>

Example 5: convert dd/mm/yyyy to yyyy-mm-dd in mysql php

$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));

Example 6: php change date format from d/m/y to y-m-d

$var = '20/04/2012';
$date = str_replace('/', '-', $var);
echo date('Y-m-d', strtotime($date));