<P> While the Gregorian calendar was implemented in Soviet Russia in February 1918 by dropping the Julian dates of 1 -- 13 February 1918 pursuant to a Sovnarkom decree , the Soviet calendar added five - and six - day work weeks between 1929 and 1940 . Although the traditional seven - day week was still recognized , a day of rest on Sunday was replaced by one day of rest in each work week . Many sources erroneously state that the weeks were organized into 30 - day months from Roman calendar . </P>
<P> While the Gregorian calendar was implemented in Soviet Russia in February 1918 by dropping the Julian dates of 1 -- 13 February 1918 pursuant to a Sovnarkom decree , the Soviet calendar added five - and six - day work weeks between 1929 and 1940 . Although the traditional seven - day week was still recognized , a day of rest on Sunday was replaced by one day of rest in each work week . Many sources erroneously state that the weeks were organized into 30 - day months from Roman calendar . </P>
when did russia stop using the julian calendar
when did russia stop using the julian calendar
February 1918
February 1918