The 8th century AD. AD and CE are the same.
The 15th century. It was the last year of it.
The first century CE began at the beginning of 1 CE and ended at the end of 100 CE. The first century BCE ended at the end of 1 BCE, and the second century CE began at the beginning of 101 CE. (Note that there is no year 0, so 1 BCE immediately precedes 1 CE.)
The 8th Century AD, which is also the 8th Century CE.
the year 1000 AD or CE
The eighth. Remember that there is no zeroth century. The first century is 1 through 100 CE, so the count of centuries is always 1 higher than the hundreds place of the year.
399 The First year of the 4th Century would be 301AD or CE as they like to call it now.
The 15th century. It was the last year of it.
The year 81 is in the first century CE.
the first century
The first century CE began at the beginning of 1 CE and ended at the end of 100 CE. The first century BCE ended at the end of 1 BCE, and the second century CE began at the beginning of 101 CE. (Note that there is no year 0, so 1 BCE immediately precedes 1 CE.)
The 8th Century AD, which is also the 8th Century CE.
the year 1000 AD or CE
1900 is the last year (the hundredth year) of the 19th century.
1492 CE is the 15th century. This is because just like there was no year "0," there was no 0th century. 01-100 CE is the first century, 101-200 is the second, and so on. A common misconception is that the century ticks from one to the next on the transition of years from '99 to '00. Since there was no year "0," the century mark actually changes from '00 to '01.
The fourth century BCE began in 400BCE; the fourth century CE began in 301CE.
The eighth. Remember that there is no zeroth century. The first century is 1 through 100 CE, so the count of centuries is always 1 higher than the hundreds place of the year.
The 13th Century.