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$DoW = $gdate % 7;
# d2g() Convert year, month, and day to date factor G.
my($Y, $M, $D) = g2d( d2g($y, $m, $d) );
return $y == $Y && $m == $M && $d == $D;
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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