Q: Claim: "The term The Common Era has been a term used to describe our calendar system for the last 2021 years."
Is the claim above correct, and can it be verified by human common sense and without a web search?
Options:
- yes
- no
Chain-of-thought:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The term "Christian Era" came around at an unknown time, presumably when it became the official Roman religion. So it was not used at the birth of the Gregorian calander. The answer: no.