Pentad calendar

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A pentad calendar is a calendar that uses five-day weeks (= pentads) as the main units. The leap day is either removed from the weekly rhythm or a pentad is extended by one day.

The pentad calendars include:

• the Discordian calendar
• the Soviet revolution calendar (until December 1, 1931, then six-day week)
• the Aztec calendar (parallel to the 13-day week )
• the Maréchal calendar ( draft calendar , parallel to the ten-day week )