Page "Week" Paragraph 5

In 1931, after its brief experiment with a five-day week, the Soviet Union changed to a six-day week.

Every sixth day ( 6th, 12th, 18th, 24th and 30th ) of the Gregorian Calendar was a state rest day.

The five additional national holidays in the earlier five-day week remained and did not fall on the state rest day.

But as January, March, May, July, August, October and December have 31 days, the week after the state rest day of the 30th was seven days long ( 31st – 7th ).

This extra day was a working day for most or an extra holiday for others.

Also as February is only 28 or 29 days depending on whether it is a leap year or not, the first of March was also made a state rest day, although not every enterprise conformed to this.

To clarify, the week after the state rest day, 24 / 25 February to 1 March, was only five or six days long, depending on whether it was a leap year or not.

The week after that, 2 to 6 March, was only five days long.