BC should appear after the numerical year, while AD should appear before it. BCE and CE should both appear after the numerical year. As is the case with most initialisms, periods may be used after each letter. 1100 B.C., A.D. 1066, 1100 B.C.E., 1066 C.E.

What comes first AD or BC?

In the modern calendar, we label all years with B.C. (before Christ) or A.D. (anno domini, or "in the year of our lord"). There is no "zero" year -- in this system, the year Christ was born is 1 A.D., and the year preceding it is 1 B.C.

Is BC older than AD?

AD stands for Anno Domini, which is Latin for "Year of our Lord," and is used to number years in the Julian and Gregorian calendars. AD denotes the calendar era after the birth of Jesus Christ. The traditionally accepted year of Christ's birth is labeled AD 1 and the year before is 1 BC.