The Tesserods Calendar shares some aspects of the Butterfly Calendar, which it can be considered an alternative to. Like Butterfly, a full seven-day week only occupies six dates with Saturday and Sunday combined.
The year follows a pattern of a regular three-month period followed by a long month. I call that pattern a tesserod, from Greek "tessera": four. It gives its name to the calendar.
Regular months have 25 dates. The long months are April and August with 5 weeks or 30 dates, and December with 28 dates.
Leap years[]
On a leap year December has 30 dates like other long months. A cycle begins with three leap years followed by ninety regular years. The next leap cycle will start on Thursday 28 December 2045 (Tess: 1 January 2046).
The average year length is:
Sample tesserod[]
| Month 1 | Month 2 | Month 3 | Month 4 | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | T | W | T | F | SS | M | T | W | T | F | SS | M | T | W | T | F | SS | M | T | W | T | F | SS | |||
| 1 | 2 | 3 | 1 | 2 | 1 | 1 | 2 | 3 | 4 | 5 | 6 | |||||||||||||||
| 4 | 5 | 6 | 7 | 8 | 9 | 3 | 4 | 5 | 6 | 7 | 8 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | |||
| 10 | 11 | 12 | 13 | 14 | 15 | 9 | 10 | 11 | 12 | 13 | 14 | 8 | 9 | 10 | 11 | 12 | 13 | 13 | 14 | 15 | 16 | 17 | 18 | |||
| 16 | 17 | 18 | 19 | 20 | 21 | 15 | 16 | 17 | 18 | 19 | 20 | 14 | 15 | 16 | 17 | 18 | 19 | 19 | 20 | 21 | 22 | 23 | 24 | |||
| 22 | 23 | 24 | 25 | 21 | 22 | 23 | 24 | 25 | 20 | 21 | 22 | 23 | 24 | 25 | 25 | 26 | 27 | 28 | 29 | 30 | ||||||