Fix todo-mode item date editing bugs

* lisp/calendar/todo-mode.el (todo-edit-item--header): Prevent out of
range error by making sure the value of the numerical month date
component cannot be nil.  Prevent wrong type error on trying to edit
day number in February by making sure numerical instead of string
value of the year component is passed to todo-read-date.
(todo-read-date): When using the numerical month date component make
sure to use `*' for an arbitrary month instead of its numerical value.

1 files changed, 9 insertions, 11 deletions

diff --git a/lisp/calendar/todo-mode.el b/lisp/calendar/todo-mode.el
index 29d8dfcfb7f..94cd08eaa4e 100644
--- a/lisp/calendar/todo-mode.el
+++ b/lisp/calendar/todo-mode.el
@@ -2262,9 +2262,8 @@ made in the number or names of categories."
                  (mlist (append tmn-array nil))
                  (tma-array todo-month-abbrev-array)
                  (mablist (append tma-array nil))
-                 (yy (and oyear (unless (string= oyear "*")
-                                  (string-to-number oyear))))
-                 (mm (or (and omonth (unless (string= omonth "*")
+                 (yy (and oyear (string-to-number oyear))) ; 0 if year is "*".
+                 (mm (or (and omonth (if (string= omonth "*") 13
                                        (string-to-number omonth)))
                          (1+ (- (length mlist)
                                 (length (or (member omonthname mlist)
@@ -2330,12 +2329,11 @@ made in the number or names of categories."
                              (if omonth
                                  (number-to-string mm)
                                (aref tma-array (1- mm))))))
-                (let ((yy (string-to-number year)) ; 0 if year is "*".
-                      ;; When mm is 13 (corresponding to "*" as value
-                      ;; of month), this raises an args-out-of-range
-                      ;; error in calendar-last-day-of-month, so use 1
-                      ;; (corresponding to January) to get 31 days.
-                      (mm (if (= mm 13) 1 mm)))
+                ;; Since the number corresponding to the arbitrary
+                ;; month name "*" is out of the range of
+                ;; calendar-last-day-of-month, set it to 1
+                ;; (corresponding to January) to allow 31 days.
+                (let ((mm (if (= mm 13) 1 mm)))
                   (if (> (string-to-number day)
                          (calendar-last-day-of-month mm yy))
                       (user-error "%s %s does not have %s days"
@@ -2347,7 +2345,7 @@ made in the number or names of categories."
                       monthname omonthname
                       day (cond
                            ((not current-prefix-arg)
-                            (todo-read-date 'day mm oyear))
+                            (todo-read-date 'day mm yy))
                            ((string= oday "*")
                             (user-error "Cannot increment *"))
                            ((or (string= omonth "*") (string= omonthname "*"))
@@ -5933,7 +5931,7 @@ number of the last the day of the month."
     (and day (setq day (if (eq day '*)
                            (symbol-name '*)
                          (number-to-string day))))
-    (and month (setq month (if (eq month '*)
+    (and month (setq month (if (= month 13)
                                (symbol-name '*)
                              (number-to-string month))))
     (if arg