A number of competing cultural, religious and racial calendars exist in the Great Land. The year is almost exactly 372 days in length and the moon orbits once every 27 days (just barely over, in fact, but the difference is miniscule). This means that there are 13.8 moon cycles in a year, an awkward number.
The Asterist calendar is a thing of great mathematical beauty and complexity which manages to reconcile these two disparate cycles into a 9-year Grand Cycle containing 124 months. It is used only by the elves and by the Asterist religion. Everyone else more or less ignores the moon and goes by the dwarven work cycle. This consists of three days of work followed by a day of rest, the cycle being known as a thk or shift-cycle. Four thkr make a vnn or shift-round, the basic 16-day unit of dwarven calendar-keeping and the cycle on which regular bills are usually due. There are, unfortunately, 23.25 vnnr in a year, which is at least an even number of thkr (93, to be precise).
Farmers and others who are more interested in seasonal weather changes tend to reckon time based on the solstices and equinoxes, following the dwarven approach (though dwarves pay almost no attention to the sky, since they seldom see it) of dividing the year into quarters, based on these key dates, and then into quarters again. A sixteenth of a year is 23.25 days, or approximately 1.5 vnnr, so in practice the farming year consists of a series of eight named periods (each divided into "early" and "late"), each consisting of 3 vnnr except for the one immediately preceding Northern Hemisphere midwinter (which is the end of the farming year). This is reduced to three thkr, a time for feasting and celebration.
Asterist New Year wanders back and forth with the moon, approximately around the Northern midwinter solstice. Dwarves don't have much truck with years as such, being resolutely non-agricultural and non-stargazing people, but they recognize the utility of a measure of time approximately that length and have a chronicle period, the lln, consisting of 16 vnnr or 256 days, a little over 2/3 the length of a solar year. Dwarven New Year, consequently, can occur at any time of the farming year.