Trivia question: what does A.D. stand for when talking about time and years (I already know the answer but I want to see who else knows and no googling)?

Dear Austin Jones,

I know this one! (sort of...) And Anna Levi is correct, it is Anno Domini, the Year of Our Lord, referring to the birth of Yeshua ben Joseph.

However, you will already know prolly that the calculations are something like seven years off, the little Christ already around five or seven years old by A.D. 1.

 Plus the fact they did not really have a concept of zero then, so in our time it would be like going from 1999 directly to 2001, instead of assigning a zero to the actual date of his birth.

But somehow the world seems to keep bumbling along anyway...with this imperfect dating system.