The 21st century ends with the year 2100. The next century begins with 2101.
It was the same for this last turnover, but everybody celebrated at the beginning of 2000, no matter what the experts said. It's the change of the numbers that gets us excited.
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It will be the final year of the 21st century.
2100 will be the last year of the 21st Century.
Because the first century started with the year 0001. The second century started with the year 0101. The third century started with the year 0201. And so it went until the 20th century started with the year 1901 and the 21st century started with the year 2001.
2030 is in the 21st century.
Oh, dude, you're asking the tough questions! Technically, the 21st century started in the year 2001, so 1969 is actually part of the 20th century. But hey, who's really keeping track, right? Like, time is just a construct, man.