How did or do other cultures measure their years and what year is the current year for those calendars?

Different cultures used different calendars to measure time and year. In this modern era we measure year according to the Gregorian calendar, so our current year is 2015. Now according to the Chinese calendar, they use the Lunisolar calendar to measure year, so right now it the year 4712 in china.

21 is the answer the answer is 21