In English, reading years is a bit of a challenge. In general, read the first two digits of a four-digit year as a whole number, then the second two digits as another whole number. This rule does have a few exceptions. Years in the first 100 years of a new millennium can be read as two two-digit numerals or as complete numbers with four digits. As millennia would be tricky to pronounce differently, they are always read as full numbers. New centuries are written as a series of hundreds. We don't use the word "thousand" when referring to years that are less than 1000 years old.