[R] ISO 8601 Weeks/Years on Windows with strptime

[Gustaf Rydevik]

2010/6/3 Michael Höhle <Michael.Hoehle at stat.uni-muenchen.de>:
> Dear R-help,
>
> I am working on a R package for public health surveillance where the ISO
> 8601 representation of dates is of importance. Especially, the ISO Week
> and ISO Year of a date needs to be extracted. I was quite happy to find
> all of this implemented in the "Date" class with appropriate calls to
> strptime/format (using e.g. %G and %V).
>
> However, only later I realized that this functionality is currently not
> implemented on Windows (I'm a happy Mac/Linux user). As this seriously
> limits the applicability, I would like to enquire, if there are any plans
> to make this functionality available in Windows as well? Or are there any
> good workarounds to make
>
>> format.Date("2001-12-31", "%G")
>
> give "2002" instead of "" on Windows?
>
> Best regards,
>
> Michael Höhle
>
> -

Hello,

This seems to be a problem that crops up from time to time.
I wrote a small function  that got the ISO week of a Date object, that
you can find in a bug-fixed version here:
http://tolstoy.newcastle.edu.au/R/e10/help/10/05/5588.html

Hope this is of help. I agree that it would be of interest to
incorporate OS-independent date management in R, but not being part of
the R development team, I'm not sure how to go about implementing
it...

Best regards,
Gustaf

-- 
Gustaf Rydevik, M.Sci.
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