Definition - What does Programmer's Day mean?
Programmer's Day is an official professional holiday in Russia. It is on the 256th day of the year, making it September 13 normally and September 12 on leap years.
Techopedia explains Programmer's Day
An employee in Parallel Technologies named Valentin Balt proposed celebrating Programmer’s Day. He petitioned the government of Russia in 2002 after gathering a long list of signatures.
A draft of an executive order instituting Programmers’ Day was issued by Russia’s Ministry of Mass Communication on July 24, 2009. Dmitry Medvedev signed the decree on September 11, 2009.