Managing date formats differences between PHP and MySQL

function mysql_date($php_date)  {
    return date( 'Y-m-d H:i:s', $php_date );
}

function php_date($mysql_date) {
    $val = explode(" ",$mysql_date);
    $date = explode("-",$val[0]);
    $time = explode(":",$val[1]);
    return mktime($time[0],$time[1],$time[2],$date[1],$date[2],$date[0]);
}

$php = strtotime($mysql);

$ymdDateAdded = date('Y-m-d');
$timeDateAdded = strtotime($ymdDateAdded);
$userDateadded = date('j F Y', $timeDateAdded);

$Date_p = new MagicDate($php_date);
$Date_m = new MagicDate($mysql_date);

$query = "UPDATE SET Date='".$Date_p->toMysql()."' "...

public function __construct($date)
{
    $phpdate = strtotime($date);
    if($phpdate)
    {
        $this->phpdate = $phpdate;
        $this->mysqldate = $this->mysql_date($phpdate);
    }
    else
    {
        $this->phpdate = $this->php_date($phpdate);
        $this->mysqldate = $phpdate;
    }
}