diff --git a/lisp/org.el b/lisp/org.el
index 077fb1942..14744e3ad 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -5209,11 +5209,11 @@ This should be called after the variable `org-link-types' has changed."
   "Regular expression for fast time stamp matching.")
 (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\\}\\)\\)?\\)"
+(defconst org-ts-regexp0 "\\(\\([0-9]\\{4\\}\\)-\\([0-9]\\{2\\}\\)-\\([0-9]\\{2\\}\\) *\\([^]+0-9>\r\n -]*\\)\\( \\([0-9]\\{1,2\\}\\):\\([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]\\{1,2\\}\\):\\([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.")