in reply to
I suggest you take a look at POSIX::strptime.
it might give you more abilities and a cleaner way to do what you ask.
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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