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 updated: "2025-04-13 20:41:00 America/Los_Angeles"
   6 ---
   7
   8 Happy Pi Day!
   9
  10 It is once again March 14!
  11 In the m/d date format, that's 3/14.
  12 But what about international Pi Day?
  13 Well if you do d/m, you are out of luck, 31/4 doesn't work because April has 30 days.
  14 Luckily for everyone, the best date format is year-month-day anyway.
  15 It's <time datetime="2025-04-13">2025-04-13</time>!
  16
  17 But we're leaving off the year.
  18 Can we get a real pi day?
  19 <time datetime="3141">3141-59-26</time> doesn't work, 59 is absolutely not a real month.
  20 We can get our first valid month 31 nonillion years from now, on <time style="word-break: break-all" datetime="31415926535897932384626433832795">31415926535897932384626433832795-02-88</time>[^1], except that months don't have 88 days.
  21 <time style="word-break: break-all" datetime="3141592653589793238462643383279502884197169399375">3141592653589793238462643383279502884197169399375-10-58</time> is also not a valid day.
  22 In fact, you have to wait until <time style="word-break: break-all" datetime="31415926535897932384626433832795028841971693993751058209749445923078164-06-28">31415926535897932384626433832795028841971693993751058209749445923078164-06-28</time> to get a valid pi day.
  23
  24 Which is also a tau day, coincidentally.
  25
  26 I am making apple pie and pizza today.
  27 Have a nice day y'all.
  28
  29 [^1]: I just barely did this one from memory, I had to look the others up.