From bc4cbbcc57a56a23c64576c8c23ecf6afb1c747b Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Thu, 29 Dec 2022 19:16:09 -0800 Subject: [PATCH] Add nndiary-headers obsolescence comment * lisp/gnus/nndiary.el (nndiary-headers): Add comment about alphabetic time zone names being obsolescent. --- lisp/gnus/nndiary.el | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lisp/gnus/nndiary.el b/lisp/gnus/nndiary.el index ab9c6dd74f9..e3fb5d8f872 100644 --- a/lisp/gnus/nndiary.el +++ b/lisp/gnus/nndiary.el @@ -339,8 +339,15 @@ all. This may very well take some time.") ;; for this header) or one list (specifying all the possible values for this ;; header). In the latter case, the list does NOT include the unspecified ;; spec (*). + ;; For time zone values, we have symbolic time zone names associated with ;; the (relative) number of seconds ahead GMT. + ;; The list of time zone values is obsolescent, and new code should + ;; not rely on it. Many of the time zone abbreviations are wrong; + ;; in particular, all single-letter abbreviations other than "Z" have + ;; been wrong since Internet RFC 2822 (2001). However, the + ;; abbreviations have not been changed due to backward compatibility + ;; concerns. ) (defsubst nndiary-schedule () -- 2.39.2