This is a calendar that I came up with to keep track of the passage of time in a campaign. I have used a similar calander in a couple of campaigns now and I like its simplicity and ease of use.

The sun travels once around this world in 336 days, visiting the 12 Lairs of the Zodiac in an appointed round that never varies. The Great Moon, called Luna, waxes and wanes in fixed cycles of 28 days (Luna’s cycle governs lycanthropy).
Each lunar cycle marks the passage of one month, which is further subdivided into four weeks of seven days each.

The standad week of seven days has the following days:

Each of the 12 months is 28 days long, made up of 4 weeks of 7 days each. The first of each month is a new moon and the 15th of each month is a full moon.

Note: All dates are from the rediscovery of the Great Northern Continent (GNC).

The Current Year is 1,342 GNC