bug#66502: 30.0.50; [PATCH; DOC] time-to-days and days-to-time use different epochs

[Bob Rogers]

   From: Eli Zaretskii <eliz@gnu.org>
   Date: Sat, 14 Oct 2023 12:02:10 +0300

   Thanks, installed on the emacs-29 branch, and closing the bug.

   Please in the future accompany the patches by a ChangeLog-style commit
   log message, it makes the patches easier to install.

Oops; I didn't do that, because I thought doc patches didn't need a
ChangeLog message.  In hindsight, they need at least a commit message,
so that was pretty silly.

                                        -- Bob