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as.Date gives NAs when transforming from factor

4 messages · Omar André Gonzáles Díaz, Jeff Newmiller, Duncan Murdoch +1 more

Omar André Gonzáles Díaz
# 
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



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.







Code:

a <- read.csv("dates.csv", stringsAsFactors = F)



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




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






# Sys.getlocale("LC_TIME")

#

# Sys.setlocale("LC_TIME", "C")












Slds,











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Jeff Newmiller
# 
Don't give a factor to as.Date. Convert it to character first, or avoid letting it become a factor in the first place by using the stringsAsFactors =FALSE option to the read.table function or its related functions.
Duncan Murdoch
#
On 05/04/2016 7:53 PM, Omar Andr? Gonz?les D?az wrote:
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
PIKAL Petr
# 
Hi

I did not have problems transforming factors to dates, only when trying to transform nonexistent date.
[1] "2015-03-31" NA
Cheers
Petr
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