[R] Format

[Rui Barradas]

Às 21:39 de 09/06/2024, Val escreveu:
> HI all,
> 
> My
> I am trying to convert character date (mm/dd/yy)  to YYYY-mm-dd date
> format in one of the columns of my data file.
> 
> The first few lines of the data file looks like as follow
> 
>   head(Atest,10);dim(Atest)
>        ddate
> 1  19/08/21
> 2  30/04/18
> 3  28/08/21
> 4  11/10/21
> 5  07/09/21
> 6  15/08/21
> 7  03/09/21
> 8  23/07/18
> 9  17/08/20
> 10 23/09/20
> [1] 1270076       1
> 
> I am using the following different scenarios but none of them resulted
> the desired result.
> 
> library(data.table)
> library(stringr)
> library(lubridate)
>          Atest$ddate1 <- as.Date((Atest$ddate), format = "%m/%d/%y")
>          Atest$ddate2 <- mdy((Atest$ddate))
>          Atest$ddate3 <= as.Date(as.character(Atest$ddate),format="%m/%d/%y")
>          Atest$ddate4 <- as.Date(as.character(Atest$ddate),"%m/%d/%y")
>          Atest$ddate5 <- lubridate::mdy(Atest$ddate)
> 
>> head(Atest,3)
>       ddate     ddate1 ddate2 ddate4 ddate5
> 1 19/08/21   <NA>   <NA>   <NA>   <NA>
> 2 30/04/18   <NA>   <NA>   <NA>   <NA>
> 3 28/08/21   <NA>   <NA>   <NA>   <NA>
> 
> 
> Any help why I am not getting the desired result.
> Thank you,
> 
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Hello,

Day is clearly first, format "%m/%d/%y" assumes a month 19 in 19/08/21.
Try

as.Date(Atest$ddate, format = "%d/%m/%y")


Hope this helps,

Rui Barradas


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