Calendar eras which are, or have been, in use.
To add an article to this category, put [[Category:Calendar eras]] in that article.
“Ab urbe condita (related with Anno Urbis Conditae: AUC or a.u.c. or a.u.) is Latin for "from the...Ab urbe condita
“Common Era (also Current Era or Christian Era), abbreviated as CE, is an alternative designation...Common Era