September 13 Programmers’ Day is an international professional holiday, recognized in many technology companies and programming firms, that is celebrated on the 256th (hexadecimal 100th, or the 28th) day of each year (September 13 during common years and on September 12). It is officially recognized in Russia and observed in several other countries.
The number 256 (28) was chosen because it is the number of distinct values that can be represented with an eight-bit byte, a value well-known to programmers. 256 is the highest power of two that is less than 365, the number of days in a common year.
Disclaimer: The information on this website is accurate to the best of my knowledge at the time of writing. I make no guarantee as to its accuracy. Its purpose is to inform, educate, amuse, and raise awareness about causes and opportunities around the globe. I also encourage civil debate in the comments.
365 Holidays a Year 