question about date's

Peter Dalgaard · 2005-12-12T15:15:59Z

Prof Brian Ripley writes: > > %W seems to be what is known as "ISO dates" (week starts on Monday), > > except that > > > >> strftime(as.POSIXlt(as.Date("2005-01-01")), "%U") > > [1] "00" > > > > should be week 53, 2004 according to my printed calendar, and emacs > > calendar-mode too. > > I _did_ say > > >> That's nothing like as easy, as it is not well-defined. > > The POSIX definition is > > %U > Replaced by the week number of the year as a decimal number

Peter Dalgaard

Mon, Dec 12, 2005 7:15 AM

Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

But not more definitive than the ISO standard, I hope. There are
probably more that 1e8 calendars printed each year according that one. 

The two routines are just not doing the same thing. Calendar-mode goes
by the ISO standard, strftime by POSIX definitions. Of course it all
depends on what the user actually wanted.

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question about date's

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