From OpenSCADAWiki
The Calendar System is Solar, years calculated from 5508 before AD, that is to the current year appended 5508, and from the current month number subtracted 2, due to the year is begin from Spring and not Winter. Reasons of the year beginning in Spring are:
- original numbered months from Antics are started from modern March due to September is 7, October is 8, November is 9 and December is 10; that is the "jewi-arias' majesty" started naming the months from the Sun rise;
- the last month of the year is February not December due to it has 28 or 29 days, that is placing one extra day per four years to compensate inequality of days in year;
- AGE (or World) at Sun in Constellation is counted from Spring (spring equinox), that is now is the Pisces Constellation with moving to the Aquarius Constellation;
- the years before AD by SLOVISH-ANTIC were counting in Summers (where Spring was just a part of Summer) due to the Life in Summer — litochiselnja (літочислення);
- year by SLOVISH-ANTIC is called as RIK (РІК), that is also as river (РІКа), which is become new in Spring after ice;
- carols of SLOVISH-ANTIC are singed on new year about birds arrival and grains sowing in warm ground for rich crop, what is obviously about Spring.