Kurdish calendar by a leap year every fourth year. It starts with the exact first day of spring according to the Gregorian calendar (March 20 or 21). Like the Gregorian system, the Kurdish calendar divides the year into four seasons: Buhar, Tawistan or Hawín, Payiz and Zimistan. It divides the year into 12 months, each month into four weeks and every week into seven days. In the Kurdish calendar the first six months (comprising spring and summer) are each 31 days long, while the next five months (in fall and winter) are 30 days each. The last winter month, the 12th month
Decimal calendar calendar. It consisted of twelve months, each divided into three "décades" of ten days, with five or six intercalary days called "sansculottides". The calendar was abolished by Napoleon on January 1, 1806. The modern Gregorian calendar does not use decimal units of time, however several proposed calendar systems do. None of these have achieved widespread use. Decimal calendar A decimal calendar is a calendar which includes units of time based on the decimal system. The original Roman calendar consisted of ten months (however, the calendar year only lasted 304 days, with 61 days during winter not assigned to any month).