We count centuries that way, because we say "1st century", "20th century", "21st century". (That is, "20th century AD".) Ordinal numbers, based on the year 1 AD.
Nobody says "178th decade", or "213th decade". Decades are cardinal numbers. Nobody starts "the decade" in the 1 year.
wow rude, I do. I think the 60s started 1961-01-01 and understand that people usually mean "the years that give a quotient of 196 when divided by 10".
I understand that we use ordinals to refer to centuries, also I understand how that's unrelated to which specific years are in a decade/century/millennium
fun fact the Australian constitution came into force on the 1st of January, 1901, aligning with the starting boundary of the 20th century.
wow rude again, that's not 'assuming the best intent of the commentator' and is against this site's code of conduct
> [I] understand that people usually mean "the years that give a quotient of 196 when divided by 10".
since I'm not a pedantic sicko that gets off on telling people they're wrong and lording my hugely advanced intellect over them, I use human words for genuine natural interactions.
Since there was no 0 AD, we count decades from 1 - 10, not 0 - 9. yes that's stupid