What Day Is Pi Day 2024. When the date is written in the format of month and date, it matches the first three digits of the pi value. March 14 is already celebrated in many countries as pi day because that date is written as 3/14 in some countries and the mathematical constant pi is approximately 3.14.
Here is the august 2024 bank holiday. March 14 has been marked as the date to celebrate pi day very year.