org-agenda-skip-timestamp-if-deadline-is-shown

org-agenda-skip-timestamp-if-deadline-is-shown is a variable defined in `org-agenda.el'.
Its value is

nil

Documentation:
Non-nil means skip timestamp line if same entry shows because of deadline.
In the agenda of today, an entry can show up multiple times
because it has both a plain timestamp and has a nearby deadline.
When this variable is t, then only the deadline is shown and the
fact that the entry has a timestamp for or including today is not
shown. When this variable is nil, the entry will be shown
several times.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.