Doomsday Rule - Memorable Dates That Always Land On Doomsday

Memorable Dates That Always Land On Doomsday

One can easily find the day of the week of a given calendar date by using a nearby Doomsday as a reference point. To help with this, the following is a list of easy-to-remember dates for each month that always land on the Doomsday.

As mentioned above, the last day of February always falls on the doomsday, as do the double dates 4/4, 6/6, 8/8, 10/10, and 12/12. Four of the odd month dates (May 9, September 5, July 11, and November 7) can be remembered with the mnemonic "I work from 9 to 5 at the 7-11." For March, one can remember the pseudo-date "March 0", which refers to the day before March 1, i.e. the last day of February; one can alternately remember the date a week later, March 7, or March 21 which is often the first day of spring in the northern hemisphere and the first day of fall in the southern hemishphere. For January, January 11 is a Doomsday during leap years, while January 10 is a Doomsday during common years; January 3 is a doomsday during common years and January 4 a Doomsday during leap years, which can be remembered as "the 3rd during 3 years in 4, and the 4th in the 4th".

Month Memorable date Month/Day Mnemonic
January January 3, January 10 (common years)
January 4, January 11 (leap years)
1/3 or 1/4
1/10 or 1/11
the 3rd 3 years in 4 and the 4th in the 4th
all ones
February "February 0", February 28 (common years),
February 1, February 29 (leap years)
2/0 or 2/1
2/28 or 2/29

last day of February
March "March 0", March 7
March 21
3/0
3/21
last day of February
often first day of spring in the northern hemisphere and first day of fall in the southern hemisphere
April April 4 4/4 even month
May May 9 5/9 9-to-5 at 7-11
June June 6 6/6 even month
July July 11 7/11 9-to-5 at 7-11
August August 8 8/8 even month
September September 5 9/5 9-to-5 at 7-11
October October 10 10/10 even month
November November 7 11/7 9-to-5 at 7-11
December December 12 12/12 even month

Since the Doomsday for a particular year is directly related to weekdays of dates in the period from March through February of the next year, common years and leap years have to be distinguished for January and February of the same year.

Read more about this topic:  Doomsday Rule

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