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    $date = '2040-01-01 12:00:00';
    echo strtotime($date);           // ¿Õ Òç³o
    echo date('Y-m-d H:i:s', strtotime($date)); // 1970-01-01 00:00:00
    ?>

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    $date = '2040-01-01 12:00:00';
    $dt = new DateTime($date);
    echo $dt->format('U');      // 2209032000
    echo $dt->format('Y-m-d H:i:s'); // 2040-01-01 12:00:00 
    ?>

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