Witch of Git - web/blog/blob - posts/2025/pi-day.md

   1 ---
   2 title: "Happy Pi Day 2025"
   3 author: Cassie Jones
   4 date: "2025-04-13 20:26:20 America/Los_Angeles"
   5 ---
   6
   7 Happy Pi Day!
   8
   9 It is once again March 14!
  10 In the m/d date format, that's 3/14.
  11 But what about international Pi Day?
  12 Well if you do d/m, you are out of luck, 31/4 doesn't work because April has 30 days.
  13 Luckily for everyone, the best date format is year-month-day anyway.
  14 It's 2025-04-13!
  15
  16 But we're leaving off the year.
  17 Can we get a real pi day?
  18 3141-59-26 doesn't work, 59 is absolutely not a real month.
  19 We can get our first valid month 31 nonillion years from now, on 31415926535897932384626433832795-02-88[^1], except that months don't have 88 days.
  20 3141592653589793238462643383279502884197169399375-10-58 is also not a valid day.
  21 In fact, you have to wait until 31415926535897932384626433832795028841971693993751058209749445923078164-06-28 to get a valid pi day.
  22
  23 Which is also a tau day, coincidentally.
  24
  25 I am making apple pie and pizza today.
  26 Have a nice day y'all.
  27
  28 [^1]: I just barely did this one from memory, I had to look the others up.