(org-agenda-skip-function
 (lambda ()
   (let ((ts (assoc-default "CLOSED" (org-entry-properties))))
     (unless (and (org-entry-get nil "P")
                  (timestamp-within-range-p "[2019-01-01]" "[2019-05-15]" ts))
       (save-excursion (outline-next-heading) (point))))))