The Greyhawk Calendar is the most common system for tracking the days and months of the Common Year in the Flanaess.
Months, Festivals & Seasons
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. Diverse 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 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 week (the fourth day), while Luna is full at various times throughout the year. Notably, both moons are full on Richfest 4.
There are five seasons—two summer seasons, low summer and high summer, totaling six months, while winter, spring, and autumn are each only two months long.
| MONTH | NAME | SEASON |
|---|---|---|
| Fireseek | Winter | |
| Readying | Spring | |
| Coldeven | Spring | |
| Planting | Low Summer | |
| Flocktime | Low Summer | |
| Wealsun | Low Summer | |
| Reaping | High Summer | |
| Goodmonth | High Summer | |
| Harvester | High Summer | |
| Patchwall | Autumn | |
| Ready'reat | Autumn | |
| Sunsebb | Winter |
Days of the Week
A week is sometimes called a sennight and periods of two weeks are commonly called a fortnight.
The names of the days of the week used in the Common Year calendar are adopted from the Flan calendar.
The days are reckoned in weeks of seven days each. In order, the days of the week are: Starday, Sunday, Moonday, Godsday, Waterday, Earthday, and Freeday. Godsday is commonly associated with worship, and Freeday with rest. The remaining days are considered workdays.
The Touv Calendar uses different names for the days of the week. They are "named for the major Touv gods or their areas of influence" — Uday, Sunday. Rainday, Lawday, Lifeday, Goldday. Kunday
An interesting feature of the Greyhawk calendar is that the days of the week always occur on the same calendar date every year, a result of the year having a number of days evenly divisible by seven.
The first of the month is always a Starday, and the rest follow as shown below:
• Starday is always on the 1st, 8th, 15th, and 22nd of the month.
• Sunday is always on the 2nd, 9th, 16th, and 23rd of the month.
• Moonday is always on the 3rd, 10th, 17th, and 24th of the month.
• Godsday is always on the 4th, 11th, 18th, and 25th of the month.
• Waterday is always on the 5th, 12th, 19th, and 26th of the month.
• Earthday is always on the 6th, 13th, 20th, and 27th of the month.
• Freeday is always on the 7th, 14th, 21st, and 28th of the month.
• Holidays
