Is the year Christ was born zero?

We can estimate when Jesus was born by counting backward from his death on Passover, Nisan 14 in the spring of the year 33 C.E. (John 19:14-16) Jesus was about 30 years old when he began his three-and-a-half-year ministry, so he was born in the early fall of 2 B.C.E.—Luke 3:23.

(New World Translation of the Holy Scriptures.)