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DSimon comments on Procedural Knowledge Gaps - Less Wrong
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There's a great mnemonic for that which helped me a lot: put your hands into fists and hold them side by side, palms down. Now starting from your left, each knuckle represents a month with 31 days, and each valley between knuckles represents a month with 30 days (or fewer, for Feb). The space between your hands does not count as a valley.
Except for the rightmost finger? Else there are 14 items.
Yeah, you stop when you run out of months.
Oh no! December is the end of the knuckle calendar! The world is going to end then!
AFAIK many use this technique. I have an instant knowledge about the number of days for every month. Once I thought almost everybody has it, but apparently it is not the case.
I have an instant knowledge about the number of days for some months; for the others I use the knuckle mnemonic (sped up by the fact that I remember that the two consecutive 31-day months corresponding to the index fingers are July and August.) I don't even have to actually close fists anymore, I just do it in my mind now.