In the year 1312, Goblin Reckoning, human-caused events occurred at Bloodharvest.
Goblins reckon from the fall of Whitehall when talking about humans.
When talking among themselves, they use other years. The Thunderblood reckon from the Tallfoot taking of Ipsath Mountain when discussing clan Tallfoot, and such call year 1312GR year 853. The Throathurters reckon not from taking possession of Bloodharvest in 238GR, but rather from 745GR, when Firetail tried and failed to take the prison. Blacktongues call this year 1, the year of their ascension.
It is cumbersome.