[R] How to change the default Date format for write.csv function?

[Henrique Dallazuanna]

Try this:

newD <- replace(d, sapply(d, function(x)inherits(x, "Date")),
format(d[sapply(d, function(x)inherits(x, "Date"))], "%m/%d/%Y"))
write.csv(newD, file="C:/temp/test.csv", row.names=FALSE)

On Mon, Dec 28, 2009 at 1:19 PM,  <George.Zou at bnymellon.com> wrote:
> Hi,
>
> I have a data.frame containing a Date column.  When using write.csv()
> function to generate a CSV file, I always get the Date column formatted as
> "YYYY-MM-DD".   I would like to have it formatted as "MM/DD/YYYY", but
> could not find an  easy way to do it.    Here is the test code:
>
> d <- data.frame(ticker=c("IBM", "IBM"), date = as.Date(c("2009-12-03",
> "2009-12-04")), price=c(120.00, 123.00))
> write.csv(d, file="C:/temp/test.csv", row.names=FALSE)
>
> The test.csv generated looks like this:
>
> "ticker","date","price"
> "IBM",2009-12-03,120
> "IBM",2009-12-04,123
>
> I would like to have the date fields in the CSV formatted as "MM/DD/YYYY".
>  Is there any easy way to do this?
>
> Thanks in advance.
>
> George Zou
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O