Anni Iroccio - Year of Iroccio. This is the commonly-used calendar in and around the Dyrwood. It is only 150 years old and Vailian in origin, created in 2680 AI, but has been adopted by the residents of Dyrwood and much of the surrounding area due to the hopeless inaccuracy of the Aedyr calendar. Though the Iroccian calendar replaced earlier Vailian calendars, the inventor, Iroccio, started from the same time as his predecessors. Pillars of Eternity begins in 2823 AI.
Iroccio calculated that it takes the planet approximately 334 days (of 26 hours) to orbit the sun, so he took the nine months from the Aedyran calendar and broke them into sixteen months of twenty days each, with each season consisting of four months. The length of each month corresponds to how long it takes Belafa (one of Eora's moons) to circle the planet. At the end of each season, three days - not part of either season or month - are set aside for people to celebrate the transitions. Lastly, the final two days of the year - New Year and Mid Year - are used to observe the beginning and midpoint of the year.
- Godandag (GAH-dahn-dahg, contraction of “Gods’ Day”)
- Cönyngsdag (COE-neengs-dahg, contraction of “King’s Day”)
- Mecwynsdag (MEH-queens-dahg, contraction of “Illustrious Queen’s [Consort’s] Day”)
- Folcsdag (FOHLKS-dahg, contraction of “Peoples’ Day”)
- Rytlingsdag (REE-tlings-dahg, contraction of “Children’s Day”)
Iroccio gave the months Vailian names, but in the Dyrwood and surrounding areas, they call them by their translated names.
- New Year - A day to celebrate the arrival of the new year. Of all the holidays, this one is celebrated by most people around the Dyrwood and the Vailian Republics. Each new year is greeted with a fervent zeal to begin things anew and start with a fresh slate.
- Deep Winter: Fonivèrno (fohn-ih-VEHR-no)
- Late Winter: Tarivèrno (tahr-ih-VEHR-no)
- Spring Dawn (3 days): Inprima - Used to celebrate the transition of the world, rebirth, and Spring. Eothasian festivals are especially prevalent at this time, or were, prior to the Saint's War.
- Early Spring: Préprima
- Mid Spring: Majprima
- Deep Spring: Fonprima
- Late Spring: Tarprima
- Summer Rising (3 days): Inestu - A period of transition from birth to growth. Many ceremonies designed to usher children into adulthood take place during Summer Rising.
- Early Summer: Préëstu
- Mid Summer: Majestu
- Mid Year - A day of reflection and introspection. The year is half over. People who made promises on New Year use Mid Year to assess their progress and renew their oaths.
- Deep Summer: Fonestu
- Late Summer: Tarestu
- Autumn Falling (3 days): Inauton - Harvest celebrations happen during Autumn Falling if the crops were particularly bountiful. If the harvest was small, supplication is given to the gods asking for a better harvest the following year.
- Early Autumn: Préauton
- Mid Autumn: Majauton
- Deep Autumn: Fonauton
- Late Autumn: Tarauton
- Winter Dusk (3 days): Inivèrno (ihn-ih-VEHR-no) - Winter Dusk is filled with celebrations of life and vigils for the dead. The world is returning to sleep, plants die, and those still alive raise a toast to another year.
- Early Winter: Préïvèrno (pree-ih-VEHR-no)
- Mid Winter: Majivèrno (mahzh-ih-VEHR-no)
- 2012-10-11, Update #20: Lore Tidbits, Campaign Almanac, Big Ol' Stretch Goals, and... Environment Screenshot!, accessed on 2012-10-11
- Pillars of Eternity Guidebook Volume One, page 13
- Forum post by Josh Sawyer