The 13th of September is a holiday of programmers who connect with their professional activity with programming area. This unofficial holiday is celebrated on the 256th day of the year.

According to the calend.ru website, the idea of celebrating that calendar was put forward by Russian programmers Mikhail Chervyakov and Valentin Balt. If today is 365 days a year, September 13, every four years is September 12.

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