I write this on Doomsday! The 6th day of the 6th month! Sounds ominous! Actually quite fun! Did you know that the 4th day of the 4th month, the 6th day of the 6th month, the 8th day of the 8th month, the 10th day of the 10th month, and the 12th day of the 12th month always fall on the same day of the week?
- In 2020 these dates are all Saturdays.
- In 2019 they were Thursdays (we leaped over Friday)
- In 2021 they are all Sundays
- In 2022 they are Mondays
- get the idea… move forward a day each year – skip a day going into a leap year!
But what of February and all the odd numbered months?
In January, doomsday is the 3rd, or 4th in a leap year
In February – the last day of the month 28th/29th is always doomsday!
In March – following from Feb’s rule we can say that the 0th day is doomsday (or remember that 7,14,21,28 are always March’s doomsdays)
May & September are easily remembered together – the 9th of the 5th month, and 5th of the 9th always fall on Doomdsay!
July & November are remembered together as the 11th day of the 7th month and the 7th day of 11th month are always doomsday
Armed with this information it makes it easy to work out what day of the week any date falls on.
If you know which day of the week is doomsday for the current year and the next two years, and perhaps the previous year you will be well on your way to impressing others, and simplifying some routine tasks. If you are forward planning Sunday Services – you will know the dates without having to keep referring to the calendar!
You may notice some key dates are always doomsday! American Independence Day 4th July, Halloween 31st October. Perhaps a birthday or anniversary falls on doomsday! Any date not on a doomsday must be with 3 days of one. Christmas Day is always D-1, St Andrew’s Day is D+2.
If you want to know how to develop this to work out any date and tell people what day of the week they were born or which day the battle of Hastings took place you can learn more at: https://www.timeanddate.com/date/doomsday-rule.html