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Friends! Netizens! Countrymen! The Dionysian era and the Common Era have no year 0 (because 0 did not exist in Europe when the Venerable Bede popularized numbering years by “the year of our lord”) so in those systems a decade runs from year 1 to year 10 and a century runs from year 1 to year 100. The 20th century runs from 1 January 1901 to 31 December 2000, and the 2010s run from 1 January 2011 to 31 December.

Unless you are an astronomer working in Julian days with a year 0 (= 1 BCE in the Common Era) the decade still has a year and a day left. If it were the other way round, then the first decade would only have 9 years (1 CE to 9 CE) and the first century would only have 99 years (1 CE to 99 CE) and all the others would have 10 or 100.

{this is a message from your local tablet scribe- if its really important, ask an expert in the scribal art}

{computer scientists- warning you against off-by-one errors since ENIAC}