"Jesus was born in year 0"
In year 0 did not actually born no one. This year there has never since year 0 was not used in the Roman count. In the sixth century monk Dionysus Exiguus (about 470-540) devised a calculation according to which Jesus had been born in 753 Roman chronological system (the foundation of the city - "ab urbe conditas"). This year was established as the year 1 of A.D. (Anno Domini). Only in modern times, when he proceeded to count negative years before Christ, the two terms have emerged as opposites. But then there was introduced the year 0, so after year 1 BC is followed by the year 1 AD. For this reason the third millennium just started on 01.01.2001, as the twentieth century began on 01/01/1901.