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When Does The Decade Start? Scientists Leave It For Debate

DENVER (CBS4) - As the final days of the decade tick away, many are now debating when the next decade starts. Is it at the stroke of midnight Jan. 1, 2020? Or Jan. 1, 2021?

Watchmakers Check Puerta del Sol's Clock Ahead of New Year's Eve
MADRID, SPAIN - DECEMBER 09: Watchmaker Jesus Lopez Terrados, 70, uses a pocket watch to check the time of a repaired watch at the Casa Losada clock shop on December 9, 2015 in Madrid, Spain. Spain's most famous clock, Puerta del Sol's clock, was built in 1860 by London based Spanish watchmaker Jose Rodriguez Losada and donated to the city of Madrid. The clock was first inaugurated in 1866 at the Real Casa de Correos and it still contains 98 percent of its original pieces. Casa Losada's watchmakers check the clock's working condition weekly, and even more often in the days leading up to New Year's Eve. Spaniards will celebrate the New Year when the Puerta del Sol's clock strikes midnight. (Photo by Pablo Blazquez Dominguez/Getty Images)

Many argue there was no year "0," so naturally the new decade starts 2021. Experts at the National Institute of Standards and Technology (NIST) say it's a matter of how you look at it.

NIST, based in Maryland, measures time, specifically the second, and is the official source of time of day. They say they don't have an official position on the debate, but still offer some scientific input.

"We can point out that the term decade refers to any ten-year period. Culturally, people have referred to a decade as a period starting with a 0 and ending with a 9 (1970-1979)," NIST stated. "That said, if someone counted the number of decades on the modern calendar, it could make sense to start at year 1 and say that 1991 started the 200th decade."

A poll by UK-based YouGov shows a majority of the 13,582 American adults surveyed believe the next decade starts in three days.

So, are you "Team Zero" or "Team One?"

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