#90: A Ridiculous Long Way to Find Out the Day of the Week You Were Born

Do you know what day of the week you were born on?  If not, you could…

  1. Ask your parent(s)/guardian(s) if they remember the day of the week.
  2. You could “Google”: What day of the week was May 16, 1975 (that’s my birthday)

OR

You can do this ridiculously long way…which is more fun IMO!

Step 1: Take the last 2 digits of the year in which you were born.

Step 2: Divide that number by 4 and ignore any remainder.

Step 3: Add the day of the month.

Step 4: Add the month’s key value.

  • January and October:Key Value = 1
  • February, March, and November: Key Value = 4
  • April and July: Key Value = 0
  • May: Key Value = 2
  • June: Key Value = 5
  • August: Key Value = 3
  • September and December: Key Value = 6

Step 5: Subtract 1 for January or February of a leap year.

Step 6:

  • Add 0 if the date is in the 1900s
  • Add 6 if the date is in the 2000s
  • Add 4 for the 1700s
  • Add 2 for the 1800s

Step 7:  Add the last 2 digits of the year.

Step 8: Divide by 7 and take the remainder.

  • Remainder 1 is Sunday
  • Remainder 2 is Monday
  • Remainder 3 is Tuesday
  • Remainder 4 is Wednesday
  • Remainder 5 is Thursday
  • Remainder 6 is Friday

Now double-check your work by searching on Google!  Bonus: Create a product that shows your work!  Look below for an example.

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