Tugtar Roimh Chríost (RCh) ar gach bliain roimh dháta traidisiúnta bhreith Íosa Críost. Tosaíonn an féilire Anno Domini le 1 AD.

Thugtaí a.C.n. (Ante Christum Natum/sular rugadh Críost) ar bhlianta roimh 1 AD. De réir a chéile tháinig BC/B.C., téarma Béarla, i bhfeidhm seachas a.C.n..

is minic anois a úsáidtear BCE ("Before Christian/Common Era") in ionad BC. Úsáidtear é i gcaint idirchreidmheach, rud a bhaineann an nimh as an scéal.

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