diff --git a/lisp/org-clock.el b/lisp/org-clock.el
index e026d93..5dbe4dc 100644
--- a/lisp/org-clock.el
+++ b/lisp/org-clock.el
@@ -1117,7 +1117,7 @@ the clocking selection, associated with the letter `d'."
 		   (looking-at
 		    (concat "^[ \t]* " org-clock-string
 			    " \\[\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}"
-			    " +\\sw+\.? +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")))
+			    " *\\sw+\.? +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")))
 	      (message "Matched %s" (match-string 1))
 	      (setq ts (concat "[" (match-string 1) "]"))
 	      (goto-char (match-end 1))
@@ -1249,7 +1249,7 @@ line and position cursor in that line."
 		 (re-search-forward
 		  (concat "^[ \t]* " org-clock-string
 			  " \\[\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}"
-			  " +\\sw+ +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")
+			  " *\\sw+ +[012][0-9]:[0-5][0-9]\\)\\][ \t]*$")
 		  end t))
 	(beginning-of-line 1)
 	(throw 'exit t))
diff --git a/lisp/org.el b/lisp/org.el
index b26e1a3..83cf4c3 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -4645,7 +4645,7 @@ means to push this value onto the list in the variable.")
 		    "\\|" org-deadline-string
 		    "\\|" org-closed-string
 		    "\\|" org-clock-string "\\)\\)?"
-		    " *\\([[<][0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [^]\r\n>]*?[]>]\\|<%%([^\r\n>]*>\\)")
+		    " *\\([[<][0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?[]>]\\|<%%([^\r\n>]*>\\)")
 	    org-planning-or-clock-line-re
 	    (concat "\\(?:^[ \t]*\\(" org-scheduled-string
 		    "\\|" org-deadline-string
@@ -5094,15 +5094,15 @@ This should be called after the variable `org-link-types' has changed."
 
 (org-make-link-regexps)
 
-(defconst org-ts-regexp "<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [^\r\n>]*?\\)>"
+(defconst org-ts-regexp "<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^\r\n>]*?\\)>"
   "Regular expression for fast time stamp matching.")
-(defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [^]\r\n>]*?\\)[]>]"
+(defconst org-ts-regexp-both "[[<]\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^]\r\n>]*?\\)[]>]"
   "Regular expression for fast time stamp matching.")
 (defconst org-ts-regexp0 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
   "Regular expression matching time strings for analysis.
 This one does not require the space after the date, so it can be used
 on a string that terminates immediately after the date.")
-(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) +\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
+(defconst org-ts-regexp1 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{2\\}\\):\\([0-9]\\{2\\}\\)\\)?\\)"
   "Regular expression matching time strings for analysis.")
 (defconst org-ts-regexp2 (concat "<" org-ts-regexp1 "[^>\n]\\{0,16\\}>")
   "Regular expression matching time stamps, with groups.")
@@ -17931,6 +17931,8 @@ This command does many different things, depending on context:
 	   (fboundp org-finish-function))
       (funcall org-finish-function))
      ((run-hook-with-args-until-success 'org-ctrl-c-ctrl-c-hook))
+     ((org-in-regexp org-ts-regexp-both)
+      (org-timestamp-change 0 'day))
      ((or (looking-at org-property-start-re)
 	  (org-at-property-p))
       (call-interactively 'org-property-action))