There is officially a calendar system in place in Rin'nikhu. The upcoming Rin'nikhu website will detail it, but I'll put it simply so you can understand date stamping your posts.
There are five days in a week (I'm going to edit previous posts accordingly), and they are, in order, Lundis, Ardis, Khandis, Rhandis, Drakhondis.
The months are based on the lunar cycle. The moon completes a cycle in 20 days in the world of Ign'nikhu. Therefor, the first week of the month is the week of the full moon, the second is the waning gibbous, the third is the new moon, and the fourth is the waxing gibbous.
There are 12 months in the year, named after the 10 great ancient adventurers who also created the calendar, as well as two of the greater deities. They are, in order: Krahn, Igrit, Almit, Reshira, Rin, Sehkran, Sol, Nintahn, Quahn, Drakhan, Probeta, and Erupsi. The months are spoken of using the ancient language as a way of differentiating when one is speaking of the historical adventurer or the month.
For example, when referring to the ancient adventurer named Rin, one would simply say "Rin". When speaking of the Month of Rin, most say "Rin'miint" (Pronounced Rehn-mE-Ent). Saying "the month of Rin" is considered ignorant, and only goes spoken without correction by less intelligent races, such as orcs or goblins.
(NOTE: This language style is also evident in the names of some regions, like "Rin'nikhu," which translates from the ancient language to "The Land of Rin", referring to the area once explored and ruled by Rin)
Currently, most players have just started in on Sol'miint. I'm going to try to edit and update old posts to have date stamps to help with accidental metagaming. Check with me during your next session to confirm your date. Those who don't play often will be asked how I can NPC their characters up to date.
Thanks everyone. Happy gaming.