for the answer provided by tenatious.

Why does one need to calculate the date?

$dv1 = $d+31*$m+365*$y;
$dv2 = $d+31*$m+365*$y;
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Couldn't it just be:

$dv1 = $yyyymmdd
$dv2 = $yyyymmdd
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Originally posted as a Categorized Answer.