The Reckoning of Rivendell is the only recorded Elvish calendar. The calendar contains six months, reflecting the seasons, rather than twelve. Its arrangement reflects the Elvish preference for counting in sixes and twelves.

Elvish time was divided into Yeni. They also have a period equivalent to a year called a Loa or Coranar. In the calendar, there are six seasons: Tuile, Laire, Yavie, Quelle, Hrive,and Coire, which may be translated into spring, summer, autumn, fading, winter and stirring.