The Day of the Programmer, also known as International Programmers’ Day, is celebrated on the 256th day of the year (September 13 or September 12 on leap years). This number is significant as it is the number of distinct values that are represented by an eight-bit byte as well as the highest power of two which is under 365.
This holiday was originally proposed by Russian programmers Mikhail Chervyakov and Valentine Bait and first celebrated in 2002. 2007 is the year credited with the inaugural International Programmers’ Day and now this holiday is recognized in other countries such as Austria, Australia, Bangladesh, Belgium, Brazil, Canada, Chile, China, Croatia, France, Germany, Guatemala, India, Israel, Mexico, New Zealand, Poland, the United Kingdom, the United States, and Uruguay.