International Pi Day 2024 Theme. Pi day is celebrated today, 14 march, round the world. The concept of celebrating pi day 2024 on march 14th (3/14) originated in 1988 when physicist larry shaw and his colleagues at the san francisco exploratorium decided.

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. The international day of mathematics (idm) is a worldwide celebration.