English date and time mnemonics

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Here are some English mnemonics related to the dates and time.

Daylight saving time

How to reset your clock for daylight saving time:

  • Spring forward, fall back.
  • Into summer, Back to winter.

Months

To remember the lengths of the months in the Gregorian calendar:

Thirty days hath September,
April, June, and November;
All the rest have thirty-one
Excepting February alone,
Which hath but twenty-eight in fine
Till leap year give it twenty-nine.

or

Thirty days hath September,
April, June, and November;
All the rest have thirty-one
Excepting February alone,
Which hath twenty-eight days clear
And twenty-nine in each leap year.

or

Thirty days has September,
April, June, and November;
All the rest have thirty-one
Except February alone,
Which has four and twenty-four
And every fourth year, one day more.

or (This requires you to specifically remember that February has 28 days.)

Thirty days hath September,
April, June, and November;
After February is done,
all the rest have thirty-one.

July and all odd numbered months before it have 31 days. August and all even numbered months after it have 31 days. February has 29 days if the year is divisible by 4 (With the exceptions that the year is divisible by 100, unless it is also divisible by 400, for example, 1600 or 2000.), otherwise it has 28 days.

Another version, non-verbal, taking advantage of the previous: by holding both hands in fists, one can see that if you count off the months, starting at the left and ignoring thumbs, the months with 31 days land on a knuckle, and the ones with less than 31 fall in between. For example, January is on the knuckle on the pinky finger, February lands in the space between, March is on the next knuckle... over to July is on the 4th knuckle. Ignoring the thumb, move to the other hand. August is on a knuckle, September is on the space between, October is on the next knuckle, and so on to December.