I am posting some information about the calendar of Hytrae today. I will put this info into the about Hytrae section as well. As noted by Cyan in The Crystal Seal, there are 470 Days in one year. Hytrae has four seasons much like our own, winter, spring, summer and autumn. I have a image below of the calendar year in which the first two books take place.
Spring begins on the 19th of Zeho.
Summer begins on 40th Firean.
Autumn begins on the 20th of Seth.
Winter begins on the 40th of Ginhay, also the last day of the year.