re: Let me teach you how to mentally quickly figure out the day of week of any date in history

took me longer to scroll thru the post than to stop caring.

Hey, Siri...

Hey, Alexa...

So the Rain Man shite was just a parlor trick?

I feel betrayed

quote:

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the windows calender on my computer only goes back to 1900

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Ask Siri

Here's an example that's a leap year in January.

Let's choose January 8th, 1988.

The numbers you get are:

3 (because 1900's use the number 3 as I said to memorize)
7 (because 12 goes into 88 seven times (remainder of 4 left over) (you always use the number 12))
4 (because you have a remainder of 4 from the previous step)
1 (because the remainder of 4 goes into 4 one time. You always use the number 4)
4 (because it's a leap year, you use Jan. 4 as your doomsday date. January 8th is 4 days from Jan 4. So because it's 4 days away, 4 is your number.

Now add up those five numbers and get:

19.

7 goes into 19 twice. You always use the number 7 for this step. So it goes into 19 twice, and you have a remainder of 5. The number 5 corresponds to Friday.

So January 8th, 1988 was a Friday.



So an easy way to remember the steps is:

1. Century number
2. Year number (see how many times 12 goes into it)
3. Remainder from previous step
4. How many times 4 goes into remainder number from step 3.
5. How many days from doomsday date.

Add it all up

See how many times 7 goes into that number, and the remainder is your final answer.

quote:

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So the Rain Man shite was just a parlor trick?

I feel betrayed

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I mean, it's not a trick. It's an algorithm. You are just doing it in your head.