Recurrence pattern: every year on December 4.

Computer Science Day is observed in Russia every December 4, commemorating the invention of the first Soviet digital computer. This informal observance marks the birthday of Russian computer science, originating from the issuance of an inventor's certificate to Soviet inventors Isaac Bruk and Bashir Rameev for their computer, M-1, on December 4, 1948. The day celebrates the advancements in computer science, which include various fields such as artificial intelligence, computer networks, and software engineering. It is a professional holiday for individuals working in theoretical and practical aspects of computer science, as well as for educators in the field. The observance highlights the significant contributions of Russian mathematicians and engineers in the development of digital computing.