strtotime.php

<?php
//strtotime.php
?>

<?php

if(isset($_POST["str_time"]))
{
    date_default_timezone_set("Asia/Shanghai");
    $t=strtotime($_POST["str_time"]);
    var_dump($t);
    echo date("Y-m-d H:i:s",$t) . '<br>';
    
    echo date("Y-m-d H:i:s",$t) . '<br>';
    echo '<hr>';
    echo(strtotime("2015-05-22 15:00:00"));
}
?>

<form method="post" action="">
date time(for example:2015-05-22 15:00:00)  <br>  
    <input type="text" name="str_time"><br>
    <input type="submit">
</form>