Heldrath Calendar

The Calendar used during much of the Third Age and after. The Heldrath Calendar is known to be the most complete and preserved Calendar that is still in existence that is still used in many places (In Thalmir in particular).

BHE (Before the Heldrath Empire)
Standing for the the time that took place before the Heldrath Empire and the Second Unification.

HE (Heldrath Empire)
Most of the known records were kept in HE even long after the fall of the Heldrath Empire in order to simplify matters (mainly the creator's).