[R] getting ISO week
ggrothendieck at gmail.com
Thu Dec 11 20:40:14 CET 2008
According to the definition in ?strptime (which is not the same as the
format(x, "%W") returns
"Week of the year as decimal number (00–53) using Monday as the first
day of week (and typically with the first Monday of the year as day 1
of week 1). The UK convention."
The first day of 2008 is a Tuesday which means that 2008 starts in week 0.
On Thu, Dec 11, 2008 at 2:31 PM, Hans W. Borchers <hwborchers at gmail.com> wrote:
> Gabor Grothendieck <ggrothendieck <at> gmail.com> writes:
>> format(d, "%U") and format(d, "%W") give week numbers using
>> different conventions. See ?strptime
> the results of format(aDate, "W") appear to be incorrect anyway, see:
> format(as.Date("2008-01-01"), "%W") #-> "00"
> There is never a week 0, this should be week 1.
> format(Sys.Date(), "%W") #-> "49"
> but my business calendar says today's (Dec. 11, 2008) week is week 50
> which is what Brian Ripleys proposed 'strftime(x, "%V")' returns.
> There could be a format "%E" (not used up to now) for returning a
> correct week number according to the European standard.
> Yours, Hans Werner
>> On Thu, Dec 11, 2008 at 7:43 AM, Gustaf Rydevik
>> <gustaf.rydevik <at> gmail.com> wrote:
>> > Hi all,
>> > Is there a simple function already implemented for getting the ISO
>> > weeks of a Date object?
>> > I couldn't find one, and so wrote my own function to do it, but would
>> > appreciate a pointer to the "default" way. If a function is not yet
>> > implemented, could the code below be of interest to submit to CRAN?
>> > Best Regards,
>> > Gustaf
>> > --------------------
>> ... [rest deleted]
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