So it seems March 14th has been officially named as the Pi day. The value of Pi is roughly equal to 22/7 which is equal to 3.14159…. So, that’s why 3.14 is used to represent the Pi day.
So, what if you are in a country that uses a different date format? For example, in India, the dates are written as dd/mm/yyyy rather than mm/dd/yyyy. So, perhaps such countries should consider July 22nd as the Pi day? To represent 22/7?