Months:

Spring:
Proem
Refrain

Summer:
Consonance
Dissonance

Fall:
Zenith
Denouement

Winter:
Obdurate
Numb
Gelid
Trepid


There are five weeks in each month. Each month is 50 days. Each weeks is 10 days. The days are:

Day of Air
Dagger Day
Day of Water
Axe Day
Pine Day
Day of Earth
Sword Day
Day of Fire
Rose Day
Windflower Day

Each day is associated with a god.


On a side note: I really don't like game calendars that use the moon, Tyr, Odin, Thor, Freya, Saturn, and the Sun to name the days- at least, not if these gods don't have any history in that world. Our 7 day week goes back a ludicrous long time, and the only thing you can sort of figure is that different societies named the days after their equivalent deities.