Quote:
Originally Posted by DNSB
Just to nitpick--the decade does not start until 2021-Jan-01. After all, there was no year 0 AD so the first decade was years 1 to 10 not 0 to 9. Much like the millenium started 2001-Jan-01. So your purchases from 2011-Jan-01 to 2020-Dec-31 are in this decade.
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I agree about the millennium, but not about the decade. A decade can start whenever you like. The common usage is to group years by their starting digits, in which case the 2020s run from now to the end of 2029.