Re: emacs-25 ed1b2de: Fix NNTP NEWGROUPS off-by-a-few-hours bug

[Katsumi Yamaoka <yamaoka@jpl.org>]

Hi,

On Wed, 13 Jan 2016 16:29:37 +0000, Paul Eggert <eggert@cs.ucla.edu> wrote:
> branch: emacs-25
> commit ed1b2de50ae87d8b2f9882be7576fbe5097df65b
> Author: Paul Eggert <eggert@cs.ucla.edu>
> Commit: Paul Eggert <eggert@cs.ucla.edu>

>     Fix NNTP NEWGROUPS off-by-a-few-hours bug

>     * lisp/gnus/nntp.el (nntp-request-newgroups): Format string
>     in Universal Time, since we’re telling the server “GMT”.
> ---
>  lisp/gnus/nntp.el |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

> diff --git a/lisp/gnus/nntp.el b/lisp/gnus/nntp.el
> index 0e10dfd..0006ef9 100644
> --- a/lisp/gnus/nntp.el
> +++ b/lisp/gnus/nntp.el
> @@ -1130,7 +1130,7 @@ command whose response triggered the error."
>         (prog1
>             (nntp-send-command
>              "^\\.\r?\n" "NEWGROUPS"
> -            (format-time-string "%y%m%d %H%M%S" time)
> +            (format-time-string "%y%m%d %H%M%S" time t)
>              "GMT")
>           (nntp-decode-text))))))

Is this really a fix?  In Japan (i.e., +0900) this doesn't seem
to pass the correct GMT date to a server:

(defun nntp-request-newgroups-test (date)
  (let* ((time (date-to-time date))
	 (ls (- (cadr time) (nth 8 (decode-time time)))))
    (cond ((< ls 0)
	   (setcar time (1- (car time)))
	   (setcar (cdr time) (+ ls 65536)))
	  ((>= ls 65536)
	   (setcar time (1+ (car time)))
	   (setcar (cdr time) (- ls 65536)))
	  (t
	   (setcar (cdr time) ls)))
    (format-time-string "%y%m%d %H%M%S" time t)))

(let ((date (message-make-date)))
  (list date
	(nntp-request-newgroups-test date)))
 => ("Thu, 14 Jan 2016 18:44:10 +0900" "160114 004410")

If removing the last `t', it returns:

 => ("Thu, 14 Jan 2016 18:44:18 +0900" "160114 094418")

See also `gnus-ask-server-for-new-groups'.

Regards,