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
strftime(x, %V)
E.g.
strftime(as.POSIXlt(Sys.Date()), %V)
is 50, and you might want as.numeric() on it.
Note that this is OS-dependent, and AFAIR Windows does not have it.
On Thu, 11 Dec 2008, Gustaf Rydevik wrote:
Hi all,
Is there a simple function already implemented for getting the ISO
A slightly simpler version is
format(Sys.Date(), %V)
On Thu, 11 Dec 2008, Prof Brian Ripley wrote:
strftime(x, %V)
E.g.
strftime(as.POSIXlt(Sys.Date()), %V)
is 50, and you might want as.numeric() on it.
Note that this is OS-dependent, and AFAIR Windows does not have it.
On Thu, 11 Dec
format(d, %U) and format(d, %W) give week numbers using
different conventions. See ?strptime
On Thu, Dec 11, 2008 at 7:43 AM, Gustaf Rydevik
[EMAIL PROTECTED] 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
On Thu, Dec 11, 2008 at 2:10 PM, Prof Brian Ripley
[EMAIL PROTECTED] wrote:
A slightly simpler version is
format(Sys.Date(), %V)
On Thu, 11 Dec 2008, Prof Brian Ripley wrote:
strftime(x, %V)
E.g.
strftime(as.POSIXlt(Sys.Date()), %V)
is 50, and you might want as.numeric() on it.
Gabor Grothendieck ggrothendieck at gmail.com writes:
format(d, %U) and format(d, %W) give week numbers using
different conventions. See ?strptime
Gabor,
the results of format(aDate, W) appear to be incorrect anyway, see:
format(as.Date(2008-01-01), %W) #- 00
There is never a
According to the definition in ?strptime (which is not the same as the
ISO definition):
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
Gabor Grothendieck ggrothendieck at gmail.com writes:
According to the definition in ?strptime (which is not the same as the
ISO definition):
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
Perhaps you mean is that the definition ought be otherwise but
at least according to one standard the definition is correct:
http://www.opengroup.org/onlinepubs/009695399/functions/strptime.html
On Thu, Dec 11, 2008 at 3:01 PM, Hans W. Borchers hwborch...@gmail.com wrote:
Gabor Grothendieck
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