CE is an alternative to the AD, system used by Christians but the numbers are the same: this year is 2021 CE or equally AD 2021 (but usually we just say this year is 2021). AD is an abbreviation of Latin: anno domini, lit. year of the lord.
Are we still in AD years?
Question: The current year is A.D. 2008. What year was it between B.C. and A.D.? Answer: A.D. stands for anno Domini, which is Latin for in the year of the Lord (in other words, after Jesus was born). There isnt any time between B.C. and A.D. The Christian church decided when to designate A.D. in the sixth century.