Convert from date to week number, howto?

Convert from date to week number, howto?

[François Pinard]

Hi, Orger friends :-)

I sometimes have to convert from a date to a week number, for when I am
shift-arrowing a clock table summarizing weeks.  It was easy at the
beginning of the year, but I see it requires more thought as year
advance.  I can write little programs to do so, but I wonder if someone
has an easy trick in Org mode (or in Emacs)?

If none, maybe that C-!, or something related to dates or calendar
display, could show the week number for each week?  (random ideas! ...)

François

Re: Convert from date to week number, howto?

[Nick Dokos]

François Pinard <pinard@iro.umontreal.ca> wrote:

> Hi, Orger friends :-)
> 
> I sometimes have to convert from a date to a week number, for when I am
> shift-arrowing a clock table summarizing weeks.  It was easy at the
> beginning of the year, but I see it requires more thought as year
> advance.  I can write little programs to do so, but I wonder if someone
> has an easy trick in Org mode (or in Emacs)?
> 

The agenda shows it in the daily/weekly view, so you can go to the date
of interest and do a day view: vd. Or you can crib the code that
calculates it and incorporate it into your own function
(org-days-to-iso-week does it but it requires a day number since BCE I
think, so you have to do some figuring).

Nick

Re: Convert from date to week number, howto?

[Jambunathan K]

> I sometimes have to convert from a date to a week number, 

Try this. 

(org-odt-format-date "<2011-12-31 Sat>" "%U")
(org-odt-format-date "[2011-12-24 Sat]" "%U")

You can steal the implementation. The functions have nothing to do with
org-odt, btw.

-- 

Re: Convert from date to week number, howto?

[Georges Ko]

Jambunathan K <kjambunathan@gmail.com> writes:

>> I sometimes have to convert from a date to a week number, 
>
> Try this. 
>
> (org-odt-format-date "<2011-12-31 Sat>" "%U")
> (org-odt-format-date "[2011-12-24 Sat]" "%U")
>
> You can steal the implementation. The functions have nothing to do with
> org-odt, btw.

Another way to get the week of the year is:

(require 'calendar)
(require 'cal-iso)

(car
  (calendar-iso-from-absolute
    (calendar-absolute-from-gregorian 
      (list month day year))))
-- 
 Georges Ko                     gko@gko.net                      2012-02-03

Re: Convert from date to week number, howto?

[François Pinard]

> François Pinard <pinard@iro.umontreal.ca> wrote:
>> I sometimes have to convert from a date to a week number

Nick Dokos <nicholas.dokos@hp.com> writes:
> org-days-to-iso-week

Jambunathan K <kjambunathan@gmail.com> writes:
> (org-odt-format-date "<2011-12-31 Sat>" "%U")
> (org-odt-format-date "[2011-12-24 Sat]" "%U")

Georges Ko <gko@gko.net> writes:
> (require 'calendar)
> (require 'cal-iso)
> (car
>   (calendar-iso-from-absolute
>     (calendar-absolute-from-gregorian 
>       (list month day year))))

Thanks for these solutions!

François