The Soviet calendar was a modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940. Several variations were used during that time.
1918 decree adopting the "Western European calendar" (click on image for translation)
Soviet pocket calendar, 1931 Numbered five-day work week, excluding five national holidays
Soviet calendar 12 December 1937 "Sixth day of the six-day week" (just below "12") ————————— "Election day for the Supreme Soviet of the USSR"
Soviet calendar 22 October 1935 "Fourth day of the six-day week" (just below "ОКТЯБРЬ")
The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year. The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people.
The Tusculum portrait of Julius Caesar
Russian icon of the Theophany (the baptism of Jesus by John the Baptist) (6 January), the highest-ranked feast which occurs on the fixed cycle of the Eastern Orthodox liturgical calendar