In contrast, every moon of the 13 moon calendar is exactly 28 days.
This type of calendar, a 28 day-calendar, was actively supported by the International Chamber of Commerce in 1931. The calendar change was supported by people such as Eastman Kodak and Mahatma Gandhi
The 28-day calendar makes accounting easier and means that any day will fall on the same day of the week, year-after-year.