Casting does not change an object. You must copy the relevant value(s) from
the object returned into a new DateTimePlus. Since DateTime's constructor
takes only a string, and I assume it won't accept your format directly,
you're better off converting the string into a Unix timestamp and creating a
new object from that. However, I leave that optimization to you. The
following code is sufficient:

    $plus = new DateTimePlus();
    $plus.setTimestamp(parent::createFromFormat("H.i d.m.Y",
    return $plus;


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