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.Definitions of months of the Reckoning of Rivendell Calendar
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.
Coire- Early Spring - "stirring".
Mettare- The last day of the year.
Yestare- The first day of the year.
Lavie- Autumn (harvest)
Enderi- "middle-days" of the Elvish year. Every twelfth year, these Enderi were increased in number from three to six.
Quelle- Latter part of autumn and the beginning of winter.
Loa- "growth" when the seasonal changes in vegetation.
Coranar- A short period or solar year.