Chetan Vashisht
Oh thats easy, use your knuckles. Use your left hand and count with your right. Starting from the left of your little finger knuckle, start moving right. You should be able to move 7 times before hitting the end. Once you do, just start again for the left. Every time you hit an upward bump it signifies 31 days, otherwise it's 30 days or feb.
That Man
Hah! Old school method :) learnt this as a kid and always took this for granted thinking this is a fairly well known technique (which I still think, probably is)
👉 Léo
This is the method I use as well. Just to clarify: the pinky knuckle is January, the space between the pinky and ring finger knuckles is February, the ring finger knuckle is March, and so on. Essentially, the trick is both July and August have 31 days (so the 31-30 pattern flips to 30-31 after August).