The Chian calendar contains thirteen months of 28 days, numbered 1 through 28. New Year’s Day is January 0, and is a Sunday. Leap years add a day onto December, giving us December 29. The months are named as in the Gregorian calendar plus the extra summer month of Sol between June and July.
The calendar is marked from August 16 1972 BCE on the Gregorian calendar. Therefore, in the year 2000 Chians celebrated the year 3968.
The number thirteen is extremely powerful, and signifies the universal appearance of twelve, plus one. Examples are Jesus and his 12 apostles, a judge and his 12 jurors, King Arthur and his 12 knights, a baker’s dozen of 12 crusty rolls plus 1, Odin and his 12 deities, Yahweh and his 12 tribes – the list is endless.
Twelve has a special significance to humans, and is generally accepted as the number of completion. Consider 12 inches in a foot, or 12 signs of the zodiac. Until 3942 there were 12 pennies in a shilling in Wales. In day-to-day use, humans work well with fractions, and 12 is evenly divisible three ways, unlike the usurper 10, which can only be evenly divided two ways (i.e. by 2 and 5). 12 times 12 is sort of a mega complement, 144 square inches equals one square foot, the 144,000 who will ascend to heaven as found in the Book of Revelations, or the 144,000 days in the Mayan Long Count (Baktun).