Question: is 2020 the end of a decade?
Answer: The anno domini era, or the common era, begins with year 1 on the Gregorian calendar. ... By that same logic, the first decade in the calendar was complete at the end of 10 CE, or 10 AD. Which means, according to the Farmers' Almanac, that the end of this decade is December 31, 2020, not December 31, 2019.