The first century BC.
Incidentally, there was no 0th century - BC or AD.
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31 days. The number of days in October has remained the same since about 45BC.
Sixteenth century.
The 11th century 0-99 is 1st century 100-199 2nd century 200-299 3rd century .. .. .. .. 900-999 10th century 1000-1099 11th century .. .. .. .. 1900-1999 20th century 2000-2099 21st century
From 1901 to 2001, this century was called the Twentieth century. This is because the first century did not begin in the year of Zero. It began at the year of one. Thus the first century ended on January 1, the century of one.
Because years 1-100 are in the first century; years 101-200 are in the second century, and so on... 2010 is in the 21st century.