January 7th is International Programmers' Day

International Programmers’ Day celebrates the positive changes that programmers make to improve our everyday lives. It is usually held on January 7, but is also popularly celebrated on September 13, or on September 12 in leap years.
Programmers are greeted with positive comments like “Happy Programmer’s Day” in some work environments on International Programmers' Day. The observance is also mentioned among programming communities in online forums and social media, including on Facebook or Twitter.