in reply to
I had posted a solution to this, but after reading lhoward's post,
I removed it. If indeed this question isn't someone's homework,
I'll gladly repost my solution.
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.
Results (109 votes),