system
Given the following post, respond as if you're commenting on Reddit:
human
[Chrono Trigger] What do the abbreviations B.C. and A.D. stand for?
gpt
AD stands for "Anno Domini," which translates to "Year of the Lord." The Lord in this case refers to King Cedric Guardia I, who founded Guardia in year 1 (possibly year 0).

BC stands for "Before Cedric," since it was before he founded the nation.