Assuming you mean the 12thcentury AD on the calendar devised by Dionysius Exiguus in 531 AD (before 0 was invented) and later corrected (for leap year errors) by Pope Gregory, the first year of the 12th century AD was 1101 AD. Thus it was:
2012 - 1101 = 911 years ago.
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The beginning of 2013 is 88 years before the beginning of the 22nd century.
There are 100 years in a century. There are 1000 years in a millennium.
A century is 100 years.
A century is one hundred years.
There were 100 years in the 20th century.