The most common timekeeping method is the Erilorian epoch. The current population uses this common system, which is based on the establishment of the Erilorian Empire, even if they don't know what it means or any of the details. It was originally taught to humans by the Veninar after first contact, and a number of alternatives replaced it over the years. It was revived by Jogan 3 vig Jerinsen, head of the Arkaeni, and his brother, King Adion 4 vig Jerinsen, in EE 10,975.
Each year is written as "EE 11,298.7" or by its shorthand version "1298.7". When used without the EE it is recognized as being shorthand. The decimal point and the number after it, in this case the "7", denotes the month. So 1298.7 would be the month of Trunalus in the year 11,298. This can also be taken further so as to include the day: 1298.7.33 (33rd day of Trunalus in the year EE 11,298). The decimal system here works perfectly because there are only 9 months to a year.