| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
SAC13 is a 13-month solar calendar with fixed four-week months, starting each year with the March Equinox. It also fixes many other issues the Gregorian Calendar has, unlike other calendar reform proposals which typically just fix very few issues but still leave a lot of problems behind that could have been easily fixed as well.
If you are here for the first time, the Introduction page is a good starting point. You can also try the calculator if you want to see the calendar in action.
The SAC13 calendar, its technical design, layout, documentation,
infos on this site, and
reference implementations
are licensed under
0BSD. It is a ‘public-domain like’ license, so you can do pretty
much all you want with SAC13.