Crops' calendar

The Crops' calendar (pronounced: 'cropes') is a lunar calendar used by the Kalikhan Academy of Sciences.

Description
The basis of the Crops' calendar is the lunar week, a period of 8 days during which the Moon completes a cycle of phases from a full moon to a new moon, and then back into a full moon. 9 lunar weeks make up a month, which is 72 days in total. To also accommodate for the solar cycle, a length of a year varies from 28 to 31 months. The solar cycle is the amount of time it takes for Earth to orbit the Sun once, totaling 26,298 days. However, a century lasts only 26,280 days — to fix this time shift, a leap century is created, where the last year of that century contains an additional month. Leap centuries occur after every 4 years.

Date format
The full date format for the Crops' calendar is:
 * [Lunar week number] Moon of [Name of the year] [Month number], [Year number] AC

As an example is written the date for the third lunar week of the seventh month of June in the year 16:
 * 3rd Moon of June 7, 16 AC

When the exact lunar week is not important, unknown or unnecessary, it can be left out:
 * June 7, 16 AC

Calendar era
The calendar follows the Carrot Era — abbreviated AC, for the Latin anno carroti, meaning "in the year of the carrot". It numbers the years since the appearance of the wild carrot as a widely grown agricultural product, starting with 1 AC. The calendar was first introduced in May 24, 3 AC.

The reason behind its implementation was to create a standardized calendar for academic work, most notably the documentation of historic events.