The Night Wars
One year is 360 days. The calendar of the Zamidan is a lunar calendar of the 13 star signs. This causes the moons to rotate through the year, so most people simply count summers. Those born before winter count one summer as the summer goes by. Those born during winter or spring do not count their first summer. Each 13 moons are named for the dominant star sign, and every 13 years rotates through those same zodiac signs.
These signs are:
A person, when being precise (or formal) of their age would state that they were born in the number of stars past, in the year name in the moon name. i.e. Jaruvan Danshar was born in the Star of the Second Cat, in the Year of the Cock, Moon of the Cock. If this is the Star of the Cock, year of the Dog, then we can determine his age to be (in the moon of the Cock) 3354 moons old (about 258 years, or 260 summers or about 94,000 days!)