Hello, I have these kind of dates: ``` > ori[[n[3]]] [1] "9/20/2021" "9/20/2021" "9/20/2021" "9/20/2021" "9/20/2021" "9/20/2021" [7] "9/20/2021" "9/20/2021" "9/20/2021" "9/20/2021" "9/21/2021" "9/21/2021" [13] "9/21/2021" "9/21/2021" "9/21/2021" "9/21/2021" "9/21/2021" "9/21/2021" [19] "9/21/2021" "9/21/2021" "9/22/2021" "9/22/2021" "9/22/2021" "9/22/2021" [25] "9/22/2021" "9/22/2021" "9/22/2021" "9/22/2021" "9/22/2021" "9/22/2021" [31] "9/23/2021" "9/23/2021" "9/23/2021" "9/23/2021" "9/23/2021" "9/23/2021" [37] "9/23/2021" "9/23/2021" "9/23/2021" "9/23/2021" "9/24/2021" "9/24/2021" [43] "9/24/2021" "9/24/2021" "9/24/2021" "9/24/2021" "9/24/2021" "9/24/2021" [49] "9/24/2021" "9/24/2021" "9/27/2021" "9/27/2021" "9/27/2021" "9/27/2021" [55] "9/27/2021" "9/27/2021" "9/27/2021" "9/27/2021" "9/27/2021" "9/27/2021" [61] "9/28/2021" "9/28/2021" "9/28/2021" "9/28/2021" "9/28/2021" "9/28/2021" [67] "9/28/2021" "9/28/2021" "9/28/2021" "9/28/2021" "9/29/2021" "9/29/2021" [73] "9/29/2021" "9/29/2021" "9/29/2021" "9/29/2021" "9/29/2021" "9/29/2021" [79] "9/29/2021" "9/29/2021" "10/1/2021" "10/1/2021" ``` they look to me as month, date, year so I formatted them as: ``` > as.Date(ori[[n[3]]], format = "%D") # or: as.Date(ori[[n[3]]], format = "%d/%m/%y") [1] NA NA NA NA NA NA [7] NA NA NA NA NA NA [13] NA NA NA NA NA NA [19] NA NA NA NA NA NA [25] NA NA NA NA NA NA [31] NA NA NA NA NA NA [37] NA NA NA NA NA NA [43] NA NA NA NA NA NA [49] NA NA NA NA NA NA [55] NA NA NA NA NA NA [61] NA NA NA NA NA NA [67] NA NA NA NA NA NA [73] NA NA NA NA NA NA [79] NA NA "2010-01-20" "2010-01-20" ``` Why the conversion did not work? Thank you
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