Greyhawk Calendar

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The Greyhawk Calendar is a fictional calendar used in the World of Greyhawk campaign setting for the Dungeons and Dragons role-playing game. It is the most common system for tracking the days and months of the Common Year in the Flanaess.

The year consists of 364 days, split into twelve months of twenty-eight days each, and four seven-day festivals, each placed at three month intervals. Different cultures have their own names for the months and festivals. The months and festivals are commonly referred to as the Dozenmonth of Luna and the Four Festivals.

The days are reckoned in weeks of seven days each. The days of the month are: Starday, Sunday, Moonday, Godsday, Waterday, Earthday, and Freeday. Godsday is commonly associated with worship, and Freeday with rest. The remaining days are considered "work days." An interesting feature of the Greyhawk calendar is that the days of the week always occur on the same day every year, a result of the year having a number of days divisible by seven.

Month	Common	Elven	Nomads	Season
Needfest
1	Fireseek	Diamondice	Tiger	Winter
2	Readying	Yellowillow	Bear	Spring
3	Coldeven	Snowflowers	Lion	Spring
Growfest
4	Planting	Blossoms	Frog	Low Summer
5	Flocktime	Violets	Turtle	Low Summer
6	Wealsun	Berrytime	Fox	Low Summer
Richfest (Midsummer)
7	Reaping	Goldfields	Snake	High Summer
8	Goodmonth	Sunflowers	Boar	High Summer
9	Harvester	Fruitfall	Squirrel	High Summer
Brewfest
10	Patchwall	Brightleaf	Hare	Autumn
11	Ready'reat	Tinklingice	Hawk	Autumn
12	Sunsebb	Lacysnows	Wolf	Winter

The months and festivals are based on the cycles of Oerth's moons, Luna and Celene. Luna has a twenty-eight day cycle, while Celene's cycle is ninety-one days. Celene is full at the midpoint of each festival, while Luna is full at various times throughout the year. Notably, both moons are full on Richfest 3-5.