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Reference.org
Programmer's Day
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<p>Programmer's Day, also known as the Day of the Programmer, is an international professional day that is celebrated on the 256th (<a href="/facts/Hexadecimal/02ohQW22">hexadecimal</a> 100th, or the 28th) day of each year (September 13 during <a href="/facts/Common_year/41sxtFAx">common years</a> and on September 12 in <a href="/facts/Leap_year/7Vfs3cTg">leap years</a>). </p><p>The number <a href="/facts/256_(number)/prnvaJIY">256</a> (28) was chosen because it is the number of distinct values that can be represented with a <a href="/facts/Byte/BNHUp9Qq">byte</a>, a value well known to <a href="/facts/Programmer/WGTS1Jv9">programmers</a>. 256 is also the highest power of two that is less than 365, the number of days in a common year. </p>