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The year that comes before 1AD is 1BC. there's no 0 (Zero) AD.
Yes, the first year of our current systems was 1AD. There was no year zero. Zero is nothing, so it cannot have something attached to it. 1BC preceded 1AD. There was no year in between these two. It is just like there is no day between the last day of one month and the first day of the next month. Right from the 1st of January 1AD we were in the year 1AD though the year was not complete until it ended. Your starting point of zero was at the very beginning of the year. The year prior to that zero point was the year immediately before it, so there is no intervening year. We went from 1BC to 1AD, not from 1BC to year 0 to 1AD.
Excluding 100BC and 500AD, there are: In BC: 99BC to 1BC = 99 years In AD: 1AD to 499AD = 499 years In total 99 + 499 = 598 years. Including 100BC and 500AD, there are: In BC: 100BC to 1BC = 100 years In AD: 1AD to 500AD = 500 years In total 100 + 500 = 600 years. You may be wondering about the lack of year 0. The BC/AD system of calendar was devised by an abbot called Dionysius Exiguus in the year designated as 247 anno Diocletiani (year of Diocletian). However, as Diocletian was a notorious persecutor of Christians, and so Dionysius decided to use anno Domini (year of the Lord) to describe the year; he worked out Christ had been born some 531 years earlier; in his time zero did not exist (as a concept) and so his first year, the year of Christ's birth, became 1AD (with the previous year now being known as 1BC). Thus 247 anno Diocletian became 531 anno Domini in the calendar system we now use.
The years between are the years from 249 BC to 1BC, and 1AD to 249AD, ie. 498 years.
All of each of 5BC, 4BC, 3BC, 2BC, 1BC, 1AD, 2AD, 3AD, 4AD, so 9 Or, you might mean 4BC ........... 4AD so 8