[R] Fwd: as.Date gives NAs when transforming from factor

[Duncan Murdoch]

On 05/04/2016 7:53 PM, Omar André Gonzáles Díaz wrote:
> Hi,
>
> I would appreciate your help.
>
> I’m having problems when transforming  a column from “factor” to “date”.
>
>
>
> It does not convert just: 31/03/2016 correctly, it out puts: NA.
>
>
>
> 04/04/2016  turns out as: 2016-04-04
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>
>
> 02/04/2016 turns out as: 2016-02-04
>
>
>
> 31/03/2016 turns out as: NA
>
> 03/04/2016 turns out as: 2016-03-04.
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> Code:
>
> a <- read.csv("dates.csv", stringsAsFactors = F)
>
>
>
> a$Date <- as.Date(a$Date, format = "%m/%d/%Y")


You are specifying month/day/year format. There's no month 31.
You probably want

a$Date <- as.Date(a$Date, format = "%d/%m/%Y")


Duncan Murdoch

>
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> Posible Solutions:
>
>
>
> I’ve read here that it has to do with the Sys Locale, and the solution was
> using: “LC_TIME”, “C”. But I didn’t have success.
>
> http://stackoverflow.com/questions/15566875/as-date-returning-na-in-r
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>
>
>
>
>
> # Sys.getlocale("LC_TIME")
>
> #
>
> # Sys.setlocale("LC_TIME", "C")
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> Slds,
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