Is this errors in Date_format function?

as.Date("09/03/2018",format="%d/%m/%y")
[1] "2020-03-09"
as.Date("09/03/2019",format="%d/%m/%y")
[1] "2020-03-09"

Strange..
it's the result.. what would be the problem?

sorry, I found the reason.
when I write as bellow, the result was correct..

as.Date("09/03/2019",format="%d/%m/%Y")
[1] "2019-03-09"

the '%y' and the '%Y" was different..

Thank you~ ^^

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