The Schmidt Calendar at a Glance

Year Published	1997
Days per Week	6-7
Days per Month	27-28
Months per Year	24
Base Year Length	668
Leap Days	2-3
Leap Day Position	end of 12, 18th, and 24th month (of 24)
Basic Intercalation Formula	59x(4x668 + 1x670) + (4x668 + 1x671)
Extended Intercalation Formula (\ denotes integer division)	2 * Y\5 + Y\300 - Y\6000 - Y\36000
Mean Length of Calendar Year	668.4033
Base Astronomical Year	Vernal Equinox
Accuracy	5 years
Cycle of Perpetuity	28 days
Mean L_S of Beginning of Year	0.0
Year Count Start	undefined
Epoch (CE)	undefined
Epoch (JD)	undefined

Notes:

Each month begins on the first day of the week. The week at the end of each quarter contains only six days.
The calendar is similar in structure to the Darian calendar, but was developed independently. It uses a different intercalation scheme (involving 670-sol and 671-sol leap years), and does not have a defined epoch.
This is one of several Symmetric Vernal Equinox Martian calendars, which generally have the following characteristics:
- Divide the Martian year into 24 months of approximately equal duration.
- Retain the seven-day week.
- Begin the year on the vernal equinox
- Place the leap day(s) at the end of the year.
Other types of 24-month calendars are:

	Martian Clock and Calendar Mickey D. Schmidt
	Calendar
	Martian Time
	Martian Time Survey 2.2