each month. Using your knuckles and the space in between
them start labeling them with the knuckle of your index finger.
Start with January and then in between February.
Check out this video for a visual. Easy Peasy once you get it.
Remember this poem?
30 Days hath September,
April, June and November
All the rest have 31,
except February which has 28,
until Leap Year gives it 29