Diary alarms

[rtnews0 . with . precept]

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In GNU Emacs 21.2.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-06-14 on dell.irenic.dyndns.org
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Create a diary file with the following content (taken from the Emacs
Info node "Appointments")

Monday
  9:30am Coffee break
  12:00pm Lunch

Create an .emacs file with the following content (also taken from the
Emacs Info node "Appointments")

(display-time)
(add-hook 'diary-hook 'appt-make-list)
(diary 0)

Run emacs with -no-site-file.  On Mondays, one alarm will be set 10
minutes before the 9:30am appointment.  The text for the 9:30
appointment has the 12:00pm line appended.

An identical setup under GNU emacs 20.5 behaves as documented in the
Info node, i.e., it sets two alarms, one 10 minutes before 9:30am and
one 10 minutes before 12:00pm.

Recent input:
<switch-frame> <switch-frame> <down-mouse-1> <mouse-1> 
C-x C-f ~ / m y p o <tab> <return> <end> <end> <end> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> M-x 
r e p r o <backspace> <backspace> o r t - e m <tab> 
<return>

Recent messages:
Loading diary-lib...done
Preparing diary...
Loading holidays...done
Loading cal-hebrew...done
Loading cal-islam...done
Loading cal-china...done
Preparing diary...done
Loading appt...done
Preparing diary...
Loading emacsbug...done