I have no doubt that is true. But the era is common because it was common to acknowledge Jesus as Lord.
Maybe, in order not to cause offence, we should date things as was once done. This year is the Second year of President Trump.
That should avoid offending anyone, right?
I agree. However, from the point of view of a non-Christian, it’s one thing to recognize a historical figure’s existence, but something else to assign that figure ultimate religious significance.