2621: AD-CE Feb 17, 2022

The system of BCE-CE for dating years as opposed to BC-AD is in some ways older than most people would likely imagine. While the abbreviations themselves are fairly new, the terminology has been found since the 18th century. However, it is exactly the same in everything but name, including quirks like not having a year 0. Since in the religious context this is based off of a fixed event, or at least intends to be, the lack of 0 makes sense with AD.