monthsand
Monthsand is a calendar concept used in speculative fiction and analyses of timekeeping. In its standard form, the year consists of twelve 30-day months, for 360 days. A five-day intercalary period at the end of the year completes the 365-day solar year, and every fourth year adds a sixth intercalary day to reach 366 days in leap years.
The name combines 'month' and 'sand,' reflecting desert imagery common in the settings where monthsand is proposed;
Monthsand is used in world-building to illustrate how societies might organize time, commerce, and seasonal life.
Variations exist across fictional cultures; some align months with lunar cycles, producing months of 29 or
See also: calendar, timekeeping, lunar calendars, worldbuilding.