[R] Strptime

[Gabor Grothendieck]

As yearmon in the zoo package can convert a month/year to
an object of class "yearmon" and that can be converted to other
classes, e.g.

> library(zoo)
> x <- "Jan-08"
> as.Date(as.yearmon(x, "%b-%y"))
[1] "2008-01-01"

On Fri, May 30, 2008 at 7:58 AM, Creighton, Sean
<sean.creighton at citi.com> wrote:
> Hi
>
> This code should explain what I'm trying to do
>
>> strptime("30-Jan-08", "%d-%b-%y")
> [1] "2008-01-30"
>>
>> format(strptime("30-Jan-08", "%d-%b-%y") , "%b-%y")
> [1] "Jan-08"
>>
>> strptime(format(strptime("30-Jan-08", "%d-%b-%y") , "%b-%y") ,
> "%b-%y")
> [1] NA
>
>
> I have a string of the form "Jan-08" but I can't seem to get strptime to
> recognise it. The format function can take the date object and using the
> given flags "%b-%y" create a string. It can't, however, seem to go back
> the other way, i.e. as in the line below:
>
>> strptime(format(strptime("30-Jan-08", "%d-%b-%y") , "%d-%m-%Y"),
> "%d-%m-%Y")
> [1] "2008-01-30"
>
> Any tips?
>
> Thanks
> Sean
>
>
>
>
>
>
>> R.Version()
> $platform
> [1] "i386-pc-mingw32"
>
> $arch
> [1] "i386"
>
> $os
> [1] "mingw32"
>
> $system
> [1] "i386, mingw32"
>
> $status
> [1] ""
>
> $major
> [1] "2"
>
> $minor
> [1] "6.0"
>
> $year
> [1] "2007"
>
> $month
> [1] "10"
>
> $day
> [1] "03"
>
> $`svn rev`
> [1] "43063"
>
> $language
> [1] "R"
>
> $version.string
> [1] "R version 2.6.0 (2007-10-03)"
>
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