org-element: Return nil for unspecified time values

* lisp/org-element.el (org-element-timestamp-parser): Return nil for
  unspecified :hour-end and :minute-end properties.
* testing/lisp/test-org-element.el: Add tests.

lisp/org-element.el

@@ -3449,7 +3449,6 @@ Assume point is at the beginning of the timestamp."
 	   (post-blank (progn (goto-char (match-end 0))
 			      (skip-chars-forward " \t")))
 	   (end (point))
-	   (with-time-p (string-match "[012]?[0-9]:[0-5][0-9]" date-start))
 	   (repeater-props
 	    (and (not diaryp)
 		 (string-match "\\([.+]?\\+\\)\\([0-9]+\\)\\([hdwmy]\\)>"
@@ -3478,17 +3477,17 @@ Assume point is at the beginning of the timestamp."
 	(setq date-start (replace-match "" nil nil date-start 1)))
       ;; Parse date-start.
       (unless diaryp
-	(let ((date (org-parse-time-string date-start)))
+	(let ((date (org-parse-time-string date-start t)))
 	  (setq year-start (nth 5 date)
 		month-start (nth 4 date)
 		day-start (nth 3 date)
-		hour-start (and with-time-p (nth 2 date))
-		minute-start (and with-time-p (nth 1 date)))))
+		hour-start (nth 2 date)
+		minute-start (nth 1 date))))
       ;; Compute date-end.  It can be provided directly in time-stamp,
       ;; or extracted from time range.  Otherwise, it defaults to the
       ;; same values as date-start.
       (unless diaryp
-	(let ((date (and date-end (org-parse-time-string date-end))))
+	(let ((date (and date-end (org-parse-time-string date-end t))))
 	  (setq year-end (or (nth 5 date) year-start)
 		month-end (or (nth 4 date) month-start)
 		day-end (or (nth 3 date) day-start)

testing/lisp/test-org-element.el

@@ -1718,9 +1718,14 @@ Outside list"
   (should
    (org-test-with-temp-text "<2012-03-29 16:40>"
      (eq (org-element-property :type (org-element-context)) 'active)))
+  (should-not
+   (org-test-with-temp-text "<2012-03-29 Thu.>"
+     (let ((timestamp (org-element-context)))
+       (or (org-element-property :hour-start timestamp)
+	   (org-element-property :minute-start timestamp)))))
   (should
    (equal '(2012 3 29 16 40)
-	  (org-test-with-temp-text "<2012-03-29 16:40>"
+	  (org-test-with-temp-text "<2012-03-29 Thu. 16:40>"
 	    (let ((object (org-element-context)))
 	      (list (org-element-property :year-start object)
 		    (org-element-property :month-start object)
@@ -1729,12 +1734,12 @@ Outside list"
 		    (org-element-property :minute-start object))))))
   ;; Inactive timestamp.
   (should
-   (org-test-with-temp-text "[2012-03-29 16:40]"
+   (org-test-with-temp-text "[2012-03-29 Thu. 16:40]"
      (eq (org-element-property :type (org-element-context)) 'inactive)))
   ;; Time range.
   (should
    (equal '(2012 3 29 16 40 7 30)
-	  (org-test-with-temp-text "<2012-03-29 7:30-16:40>"
+	  (org-test-with-temp-text "<2012-03-29 Thu. 7:30-16:40>"
 	    (let ((object (org-element-context)))
 	      (list (org-element-property :year-end object)
 		    (org-element-property :month-end object)
@@ -1745,16 +1750,21 @@ Outside list"
 		    (org-element-property :minute-start object))))))
   ;; Date range.
   (should
-   (org-test-with-temp-text "[2012-03-29 16:40]--[2012-03-29 16:41]"
+   (org-test-with-temp-text "[2012-03-29 Thu. 16:40]--[2012-03-29 Thu. 16:41]"
      (eq (org-element-property :type (org-element-context)) 'inactive-range)))
+  (should-not
+   (org-test-with-temp-text "[2011-07-14 Thu.]--[2012-03-29 Thu.]"
+     (let ((timestamp (org-element-context)))
+       (or (org-element-property :hour-end timestamp)
+	   (org-element-property :minute-end timestamp)))))
   ;; With repeater.
   (should
    (eq 'catch-up
-       (org-test-with-temp-text "<2012-03-29 ++1y>"
+       (org-test-with-temp-text "<2012-03-29 Thu. ++1y>"
 	 (org-element-property :repeater-type (org-element-context)))))
   ;; Timestamps are not planning elements.
   (should-not
-   (org-test-with-temp-text "SCHEDULED: <2012-03-29 16:40>"
+   (org-test-with-temp-text "SCHEDULED: <2012-03-29 Thu. 16:40>"
      (org-element-map (org-element-parse-buffer) 'timestamp 'identity))))