Programmer's Day
September 13, Saturday

The number 256 (28) was chosen because it is the number of distinct values that can be represented with a byte, a value well known to programmers. 256 is also the highest power of two that is less than 365, the number of days in a common year.
Programmer's Day in other years
- 2022 September 13, Tuesday
- 2023 September 13, Wednesday
- 2024 September 12, Thursday
- 2026 September 13, Sunday