Why are people convinced the decade ends tonight?

the decade doesnt end until next year and this is why: the first decade went from year 1 to year 10 i will show you 1st day to 365th is year 1(1) year 2(2) year 3(3) year 4(4) year 5(5) year 6(6) year 7(7) year 8(8) year 9(9) year 10(10) new decade year 11(1) year 12(2) . . year 20(10) if you... show more the decade doesnt end until next year and this is why:
the first decade went from year 1 to year 10 i will show you
1st day to 365th is year 1(1)
year 2(2)
year 3(3)
year 4(4)
year 5(5)
year 6(6)
year 7(7)
year 8(8)
year 9(9)
year 10(10)
new decade
year 11(1)
year 12(2)
.
.
year 20(10)

if you continue that pattern you will find out that the decade doesnt end until next year.

why does the media and so many other people say that the decade ends tonight?
Update: 2000 was part of the previous decade and i did account for the first year from day 1 to 365.
Update 2: from year 0 to year 1 was year 1. that was my first year where i said from the 1st day to the 365th. if you dont believe me do the pattern. and see
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