30 b.C.
Well, it depends on what year you are looking for, but 40 years ago from 2010 was the year 1970
it was -2012
The current year is 2011 AD, so the year 2000 years ago was 11 AD. 2500 years ago is 2011 - 2500 = -489, so that would be 489 BC.
12
2010 - 2000 = 10
2011 - 31 = 1970
If the year is 2000, then 3000 years ago would be the year 1000 BCE (Before Common Era). This is calculated by subtracting 3000 from 2000, resulting in -1000, which corresponds to 1000 BCE in the Gregorian calendar.
The year 992 BCE
12 AD.
-1000
If you subtract 2013 from 2000 you are left with 13 so it is 13AD
The year 2000