Doomsday Rule
An algorithm to know the day of the week for a given date (method valid for dates from 1800s to 2000s)
How can you quickly and accurately calculate the day of the week associated with a specific date? Use the following calculations:
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Don't forget Ordered lists:
- Start by taking the last two digits of the year, this is your startingNumber.
- Divide the startingNumber by four and ignore the remainder.
- Add the result to startingNumber.
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Find the month code:
- Make sure to style list items to:
- Not forgetting child list items
- Not forgetting child list items
- Not forgetting child list items
- Not forgetting child list items
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In leap years, subtract one from the month code for January and February.
Find if the year is leap. (Century years must divisible by 400, non-century year, last two digits must divisible
by 4)
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Add the month code number.
- Add the day of the month.
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If year is in 2000s subtract 1, if year is in 1800s add 2.
- Find the remainder of dividing the total by 7.
- Find the day of the week according to the day codes. Starting Saturday: 0, Sunday: 1, ... , Friday: 6
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