time is partitioned into decades: years 10X to 10X + 9 CE inclusive for any integer X. that's why 11 BCE to 2 BCE (-10 CE to -1 CE) is considered the negative first decade. it makes perfect sense. ask your historian friend
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"2000 was the final year of the Nineties" and other arguments against 1-indexing
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this is the 21st century since we started counting centuries one century early
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