Hello,
>
> I would like to know for each variable what is date format?
> Is it “ %y-%d-%m “ or “ %m-%d-%y “
>
It's 4 digits, with uppercase 'Y'
Try
Data <- data.frame(var1=c("12-15-2011", "12-15-2011", "12-17-2001"),
var2=c("2001-15-12", "2001-15-01", "2001-15-01"),
stringsAsFactors=FALSE )
str(Data)
yr <- sapply(sapply(Data, strsplit, "-"), function(x) which(nchar(x) == 4))
yr
[1] 3 3 3 1 1 1
To have the result with the same dimensions as your original data.frame
(but with a different class, I don't believe it matters)
matrix(yr, ncol=ncol(Data))
Hope this helps,
Rui Barradas
--
View this message in context:
http://r.789695.n4.nabble.com/Date-formate-y-d-m-or-m-d-y-tp4548736p4549342.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
