Pathfinder Campaign World-building: Calendar
Perhaps of interest to the players, here is the calendar system being used in Caldonia.
The year is divided up into twelve months of 30 days each, divided into three 10-day 'weeks'. The months are named after the deities whose domains are closely related to the time in question. Since the solar year takes 364 days, every three years a 12-day leap period gets added in after the last month of the year - this realigns the calendar year with celestial events like the solstices and the full moon (lunar cycle lasts 27 days). Thus, the first year in the three-year leap cycle always begins on the winter solstice and with a full moon. The months are named as follows:
Arhu Khionet (winter) - solstice on the 1st, 5th, or 9th
Arhu Oreithyet (winter)
Arhu Galatayet (spring)
Arhu Asklepyet (spring) - equinox on the 2nd, 6th, or 10th
Arhu Khloriste (spring)
Arhu Amerat (summer)
Arhu Jaduste (summer) - solstice on the 3rd, 7th, or 11th
Arhu Perseste (summer)
Arhu Karmanet (autumn)
Arhu Isistet (autumn) - equinox on the 4th, 8th, or 12th
Arhu Let (autumn)
Arhu Rhadamante (winter)
{every three years: Diru Serapiste}
The leap period is dedicated to Serapis, but each deity, no matter how minor, has a particular day during this period when they can communicate with their followers directly, without the need for clergy as intermediaries.
(Etymology note: The terms for month (arhu) and intercalary period (diru) are taken from Akkadian, the language spoken in Babylon, whose calendar I used as a jumping-off point for coming up with this one. In terms of the game world, these words belong to a dead language spoken during or before the Allekheirn Empire, which still has a few lexical hold-outs like calendar terms, or other instances where extant civilization owes some sort of technological or cultural innovation to them - similar to how we got 'paper' from 'papyrus'. The word-final -te or -t is a fabricated indicator of the genitive case determined by whether the noun ends in a vowel or consonant (though please enjoy the irregularity in Leto becoming Let and Isis becoming Isistet - Elf is to thank for reminding me that irregularity adds flavor to language, and also she picked out all the gods for each month)). I can forgive someone thinking the declensions were based on grammatical gender - but no, that would be far too much work. No grammatical gender in my fantasy languages, thankyouverymuch.)
(Also, because this is a fantasy world, there's none of this "years are actually fractions of a second shorter/longer than X number of calendar days, requiring adjustment in a few thousand years" nonsense. Duration of the solar year is conveniently regular, which might bore astronomers, but makes my job far easier.)