I make my own calendars for each setting. Rhunaria's most-used calendar is the Common Measure, which has 8 months of 28 days, each separated by a day that is separate from them, for a total of 232 days in each year. Each month is 4 weeks of 7 days each, and a day is 24 hours of 60 minutes each and 60 seconds per minute, so the basics are similar to Earth's.....
It's wierd, though; there's a solar eclipse 4 times each year in Rhunaria, marking 4 'dread days' on which folks tend to stay inside and lock the doors. Evil spirits and nocturnal creatures like orcs are believed to prowl about on those days. The day after each new moon is the start of a new month, and every other new moon occurs on the eve of a 'dread day'. However, on the other 4 days of new moons are 'festival days', where there is no solar eclipse, and these are celebrated in an appropriate manner for the season. In fact, each of those 4 new moons occur on the eve of an equinox or solstice, marking the longest and shortest days of the year. Fest Day on the vernal equinox, Midsummer's Rejoice on the summer solstice, Resting Day on the autumnal equinox, and Midwinter's Solace on the winter solstice.
Months have simple names; Fallow for the 1st month, which is the start of spring; Seeding for the 2nd month, end of spring; Suncrest for the 3rd month, start of summer; Heatwrath for the 4th month, end of summer; Harvester for the 5th month, start of autumn; Gatherfast for the 6th month, end of autumn; Cloudblight for the 7th month, start of winter; and Culling for the 8th month, end of winter. The days are pidgin names; Dayun for 'day one', Daytu for 'day two', Dayri for 'day three', Dayir for 'day four', Dayev for 'day five', Dayas for 'day six', and Dayen for 'day seven'. Specific holidays vary from one country or culture to another, of course.
Other Rhunarian calendars include the Divine Measure of Time used in the human Theocracy of Riza, the Dalechron Annum used by dwarves of the Ur-Dalechron Hegemony, the Imperial Calendar used by the human Hirotashi Empire, and Elvish Reckoning, plus whatever the dragons use, if anything; they certainly haven't bothered to share much of their lore with humanoids. These are calendars I haven't finished detailing yet, as they haven't come up in-play; though the group did pass through both Ur-Dalechron and Riza, there wasn't any point in which they actually needed to refer to those regional calendars.
Elvish Reckoning has no months, dread-days, or festival-days, just 4 seasons of 58 days each. The day after the vernal equinox is the 'start' of Spring and the new year in Elvish Reckoning. Each season is divided into 5 weeks by the elves, and an elven week is 12 days, except for the 2nd and 4th week of each month, which have only 11 days (a bit odd, of course). Elves refer to each day of the week by its number in the Elven language. Elvish Reckoning uses a series of 3 cycles, however, that they mark as significant. Every 100th year starts a new cycle, based on the position of the star elves call the Eye of the Spirit King.
During the Cycle of Dawn, first of the series, the Eye of the Spirit King is visible in the early mornings for a few hours past dawn, shining brightly in the north. That cylce is said to be a time of good luck and growth. During the Cycle of Dusk, it is visible in late afternoon to the southeast. Finally, in the Cylce of Twilight, before the 'rebirth' of the Cycle of Dawn, the Eye of the Spirig King is visible in the eastern sky past midnight. The Cycle of Twilight is said to be a time of ill fortune and diminishment.
The other Rhunarian calendars are only partially finished in my notes, and Elvish Reckoning still has a few minor details to iron out.
I have several vague calendar ideas in the works for Aurelia, but haven't ironed them out yet as I did for Rhunaria (but then, I haven't run a campaign in Aurelia yet either, unlike Rhunaria). Mostly just names so far. Dosa Garan, the Seasonal Record of Neharon and Urun humans' common ancestors. Imperial Standard Reckoning, timekeeping measure of old and modern Thessk and other human countries. Kehemet Uroth Basra Sajik, the Annals of Basra and Her Kin and What Came Before, for Basranni and Mitajji human countries. Mentari Tenzeki Kodamaru, the Mentari's Heavenly Motions Record of Time. Zurgithras Crenastis, the Time of Gith's Rise and All That Follows. Fey Nelerist, the Fey Reckoning in Elven. Inferna Metra, the Infernal Measure of time. And numerous others I haven't even gotten as far as naming yet.
I haven't finished anything yet for my Azeria setting's calendar, or at least can't remember, because the majority of my Azeria notes are on my old computer and I'm not even sure its data would still be recoverable from the hard drive, given how long I was missing the cords and other components needed to plug the thing back in and hooked up to a monitor and junk.
