Re: filtering mail from a group

["Sergio Martínez" <samf0xb58@gmail.com>]

Erik Colson <eco@ecocode.net> writes:
>
> Hi Sergio!
>
> Thanks for your answer!
> I don't want to put mails in another mailbox. I want to limit the mails
> to mails posted after a certain date, without removing the older ones
> from the mailbox. It is doable with / t but that makes me calculate
> again and again the number of days since the 'filter date'. Because / t
> requires to enter a number of days and not a date...
>
> Thanks for helping !
> --
> erik

OK, maybe this can help you:

---------------------------------------------------------------
(defun gnus-summary-limit-to-date (date &optional after-p)
  "Limit the summary buffer to articles before DATE.
If AFTER-P (the prefix) is non-nil, limit the summary buffer to
articles that are after DATE."
  (interactive 
   (let ((after current-prefix-arg)
	 date-string)
     (setq date-string
	   (if after
	       (read-string "Limit to after the date: ")
	     (read-string "Limit to before the date: ")))
     (list date-string after)))
  (let (date-string age)
    (setq date-string
	  (if (string-match-p ":+" date)
	      date
	    (concat date " 00:00" )))
    (setq age (days-between (current-time-string) date-string))
    (gnus-summary-limit-to-age age after-p)))
----------------------------------------------------------------

Put this in your .emacs or .gnus file, then in the summary buffer do
M-x gnus-summary-limit-to-date RET.
It prompts you for a date to limit articles before that date or after if
a prefix argument is given (i.e. C-u M-x gnus-summary-limit-to-date RET).

Note that the date is in a format accepted by `parse-time-string', for
example: "2012-01-01" or "Mon, 30 Apr 2012 22:40:05 -0500", etc.

I hope this can be useful. Let me know if it does not fit your needs.

--
Sergio