Calendar

The RimWorld calendar is a much-simplified version of the modern-day Western (Gregorian) calendar.

From the game...

"The year is divided into 4 quadrums* of 15 days each. Quadrums are the same everywhere, while seasons are different in different places."

What this means is that while "Summer" and "Winter" are opposite depending whether one is north/south of the equator, and practically speaking if you are anywhere near the equator you have two "hot" seasons and two "not-quite-so-hot" seasons, the names of these 4 quadrums* are the same for everyone anywhere on the map.

(* The word "quadrum" is from the Latin for a 4-sided shape (square/rectangle), so here something of 4 sides returning back where it started; think "quarters" if you prefer.)

The names of these 4 quadrums are:

• Aprimay
• Jugust
• Septober
• Decembary

Mouse-hovering over the in-game date (lower right-hand corner) will tell you what local "seasons" these represent for the settlement currently viewed. Note that if you have settlements on both sides of the equator, these seasons might be different, but the quadrum names will stay the same everywhere.

In any scenario, the starting year is 5,500, and the starting quadrum is Aprimay (which relates to "Autumn if you are located in the southern hemisphere, or "Spring" if you are located in the northern).

"60 day" years?

4 quadrums of 15 days each is a 60 day "year" - pretty short compared to the one we are used to. If you prefer, you can think of each in-game "day" as representing a little less than a week's worth of progress, 6 real-life days for each in-game calendar day, to be precise, for a 360 day year.

• See also: Lore