Heximal Calendar

The Heximal Calendar is a Gregorian calendar reform proposed by Tab Atkins-Bittner, designed to be better compatible with an accompanying number system reform to base-6 (heximal).

The Heximal Calendar is a perpetual solar calendar, with six days in a week, six weeks in a month (except December), and ten months in a year. There is thus thirty-six (100₆) days in each month (except December), extending smoothly from the related Heximal Time reform that has thirty-six hours in a day, thirty-six minutes in an hour, and thirty-six seconds in a minute, for a 100₆:1 ratio of every major grouping until you finally hit the month:year and have to break it.

The ten months reuse the Gregorian month names, but drop July and August (as the most recently-renamed months); thus the sequence is: January, February, March, April, May, June, September, October, November, December. (The months Sep-Dec return to their original numerically-appropriate positions as the 7th-10th months, so their names return to making sense.)

The days of the week retain their astronomical names, with the Norse names replaced with more astronomy: Sunday, Monday, Vensday, Marsday, Joday, Saturday. (Names taken from the Sun, the Moon, then Venus, Mars, Jovian (Jupiter), and Saturn).

January through November

Sunday	Monday	Vensday	Marsday	Joday	Saturday
1	2	3	4	5	10
11	12	13	14	15	20
21	22	23	24	25	30
31	32	33	34	35	40
41	42	43	44	45	50
51	52	53	54	55	100

December

Sunday	Monday	Vensday	Marsday	Joday	Saturday
1	2	3	4	5	10
11	12	13	14	15	20
21	22	23	24	25	30
31	32	33	34	35	40
41	42	43	44	45	50
51	52	53	54	55	100
101	102	103	104	105	*110

(*December 110th is the Leap Day, only present one year in four.)

On leap years the calendar perfectly divides into 6-day weeks; on the other years the week progression skips straight from Joday, Dec 105th to Sunday, Jan 1st, omitting a Saturday. Traditionally that final Joday (New Years Eve) would be treated as a weekend day, rather than the final day of a normal workweek.