1AD to 100AD.
The first century AD consists of the years 1AD to 100AD.
The sixth century BC:1BC - 100BC = 1st century BC;101BC - 200BC = 2nd century BC;201BC - 300BC = 3rd century BC...and so on:501BC - 600BC = 6th century BC.Remember that there was no 0 A.D., so the first century BC ended with 1BC, swiftly followed by the first century AD that started with 1AD.
The 1st of January 1AD.
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.
The year 79 was in the 1st century. This is the same year that Mount Vesuvius erupted and destroyed Pompeii.
The year that comes before 1AD is 1BC. there's no 0 (Zero) AD.
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The first century AD took place between 1AD and 100AD. Therefore, for every hundred years, you are in fact in the century AFTER the multiple of 100 years to which you would round down to. For example, the second century was between 101 and 200, the fifteenth century was between 1401 and 1500, and the twenty-first century is between 2001 and 2100.