One Yih year is 1.47 Earth years long. One Yih day is 24.39 Earth hours long. There are exactly 528 Yih days per Yih year.
Since Yih has no moons, there are no months. Rather, a year is divided into four quarters of 132 days each that align with the seasons. The new year starts on the Southern Hemisphere's vernal equinox.
The next time division lower than a quarter is the “week” which is based on a yinrih torpor cycle of 12 days, making each quarter 11 weeks long. Dates are generally given year, quarter, week, day.
Before First Contact, the traditional epoch is the Great Kindling, which is given as the first evidence of written language roughly 100 thousand Earth years (68010 Yih years) prior to First Contact. This is denoted in English as AK (after Kindling). After meeting humans, First Meeting becomes the new epoch, with years reckoned BFM (Before First Meeting) and AFM (After First Meeting).