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Day of the Programmer · day 0x100

Happy Programmers’ Day

The 256th day of the year — one day for every value a single byte can hold.

Why 256
28 = 0x100: the values in one byte, and the highest power of two that fits in a year
When
13 September, or the 12th in a leap year
Official
in Russia, by a decree signed on 11 September 2009 · source

13 September in common years, 12 September in leap years.