Re: babel and computing a number of months

[Alan Schmitt <alan.schmitt@polytechnique.org>]

On 2014-06-02 10:13, Alexis <flexibeast@gmail.com> writes:

> Alan Schmitt writes:
>
>> I need to work with dates for some code/scripts I'm writing in a
>> document making heavy usage of source blocks and babel evaluation. The
>> good news is that I have access to many programming languages, so the
>> bad news is I don't know which one to choose. The problem I want to
>> solve is the following: I want to compute the number of months between
>> march 1st, 2014, and the beginning of the current month (so right now
>> it's 3, but on may 31st it was 2). Is there an easy way to do it in a
>> babel supported language?
>
> How about Perl with either DateTime::Moonpig:
>
> https://metacpan.org/pod/DateTime::Moonpig
>
> or Time::Piece:
>
> https://metacpan.org/pod/Time::Piece

Thank you for the suggestion. I finally did a very hackish simple
solution:
#+begin_src emacs-lisp
(defun nbmonthssince (year month)
  (let* ((tm (decode-time))
	 (cmonth (nth 4 tm))
	 (cyear (nth 5 tm)))
     (+ (* 12 (- cyear year)) (- cmonth month))))
#+end_src

Alan