this post was submitted on 31 Mar 2026
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30 days, has September, April, June, and November. All the rest have 31 except for February which has 28, and once in 4 it has 1 more!
Here's a version from the 16th Century
Thirty dayes hath Nouember, Aprill, Iune and September; Twentie and eyght hath February alone, And all the rest thirty and one, But in the leape you must adde one.
... except in 100, when it doesn't, except again in 400, then it does.
Also from time to time a freak minute with 61 seconds appears out of the blue.
As someone who's dyslexic and nearly 40 I will never remember this for as long as I live no matter how many times I've heard it.
There's a much easier way to remember. Ball your two hands into fists in front of you and put them together so that you have your knuckles on top, sans thumbs. Start counting from left, knuckles are hills, the gap between them are valleys. Months falling on valleys are shorter. Months falling on hills are always 31 days.
You have a valley and a knuckle left.
It’s the first time I’ve ever seen it written, though I wrote it myself. I’ve only ever known it verbally because it rhymes!
I just do the knuckles method (you have to remember February, but other than that it’s perfect).
Knuckle bros!
at some point in life I just precomputed the list of length 12 (except the leap year consideration) and memorized it
If the year is divisible by 100 but not by 400 then February has 28 days despite the fact that the year will also be divisible by 4.
Oh yeah. Thanks, Pope Gregory!