SK-42 reference system

The SK-42 reference system, also known as the "Soviet Calendar" or "Soviet Era," is a calendar system that was used in the Soviet Union. The SK-42 system is based on the Gregorian calendar but has a few modifications specific to the Soviet context. One of the notable features is that it emphasizes the Soviet era, starting from the year 1917, which is marked by the Bolshevik Revolution.