The 21st century
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It's the 10th year of the 21st Century.
Because years 1-100 are in the first century; years 101-200 are in the second century, and so on... 2010 is in the 21st century.
In 2010. To prove it, look at the eighties: 1980-1989. So the second decade of the twenty-first century is from 2010-2019.
as we are now in the 21st Century, the decades start as 2010, 2020, 2030, 2040, 2050, 2060, 2070, 2080, 2090 and the 22nd Century will start as 2100
Since 1982, it repeated in 1993, 1999, and 2010. For the rest of this century, it will repeat in 2021, 2027, 2038, 2049, 2055, 2066, 2077, 2083, 2094, and 2100.