. "Shift Calendar"@en . . "The Shift Calendar is not a calendar (proposal) by itself, but a supplementary concept that is compatible with any calendar that has arranged in 3 months of or 3 months of and 1 extra day outside the month cycle. It works well with , but probably better with leap-day calendars. The idea is to define several shift plans and work week independent of the actual 7-day week, but fixed to the calendar, cf. market weeks and Indonesian pawukon. Normal 7-day weeks and 13-day cycles are the only ones which complete the 91 days of a quarter without holiday."@en . . . "The Shift Calendar is not a calendar (proposal) by itself, but a supplementary concept that is compatible with any calendar that has arranged in 3 months of or 3 months of and 1 extra day outside the month cycle. It works well with , but probably better with leap-day calendars. The idea is to define several shift plans and work week independent of the actual 7-day week, but fixed to the calendar, cf. market weeks and Indonesian pawukon. There are 5 cycles of 6 days called hexads and, likewise, 6 cycles of 5 days, pentads, per month. In months 31 days long, the final day is a holiday. Leap days and weeks and intercalary days are treated like holidays. Every hexad can also be subdivided into 2 sub-cycles of 3 days each, i.e. triads. Each cycle, whether 3, 5 or 6 days long, has one free day, which alternates among shift groups. There are also 3 larger cycles of 10 days per month, named decads, where each includes 3 days off. A half month of 3 pentads or 5 triads is called a crescent. An integer number of cycles with 9 days, termed nonads, or 18 days fit well into the 90 regular days of a quarter, but they do not align with the cycles mentioned above inside 30-day months. Normal 7-day weeks and 13-day cycles are the only ones which complete the 91 days of a quarter without holiday."@en . . .