Do you think that when we write the year, we should always put "A.D." to help future historians? ?

Question

Example:

2008 A.D.

Answer 1

Not necessary. They didn't have typewriters (nor computers) 2008 BC. The context is obvious.

By the way, scholars no longer us the BC v AD distinction, rather BCE and CE (Before Common Era vs Common Era).

Answer 2

If they're worth anything they'll be able to contextualize A.D. vs. B.C.