Key facts
- Observed by
- Worldwide
- Type
- International
- Date
- 256th (hexadecimal 100th, or the 2 th) day of each year (September 13 in common years, and September 12 in leap years) in Russia
- 2025 date
- 2025-09-13
- Duration
- 1 day
- Frequency
- Annual
- Related to
- Engineer's Day
via Wikipedia infobox
~2 min read
Article
Programmer's Day, also known as the Day of the Programmer and occasionally as Day 2^8, is an international professional day that is celebrated on the 256th (hexadecimal 100th, or the 2th) day of each year. This is September 13 in common years and September 12 in leap years.
The number 256 (2) 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 and 366, the number of days in a common year and leap year respectively.
Connections
Pi Day
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January 16
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Dmitry Medvedev
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leap year
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byte
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hexadecimal
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President of Russia
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programmer
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common year
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256
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Cabinet of Ministers of Ukraine
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Engineer's Day
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Ministry of Digital Development, Communications and Mass Media of the Russian Federation
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kremlin.ru
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Administrative Professionals' Day
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