Fix two parse-time-months invalid assumptions

* lisp/gnus/nnimap.el: Do not require parse-time.
* lisp/gnus/nnimap.el (nnimap-find-expired-articles):
* lisp/net/pop3.el (pop3-make-date):
Just use system-time-locale and format-time-string; no need to
refer to parse-time-months.
* lisp/net/pop3.el (parse-time-months): Remove defvar.
* lisp/net/tramp-smb.el (tramp-smb-read-file-entry):
Add FIXME comment about this.

lisp/gnus/nnimap.el

@@ -36,7 +36,6 @@
 (require 'nnoo)
 (require 'netrc)
 (require 'utf7)
-(require 'parse-time)
 (require 'nnmail)
 
 (autoload 'auth-source-forget+ "auth-source")
@@ -1097,12 +1096,8 @@ textual parts.")
 	(let ((result
 	       (nnimap-command
 		"UID SEARCH SENTBEFORE %s"
-		(format-time-string
-		 (format "%%d-%s-%%Y"
-			 (upcase
-			  (car (rassoc (decoded-time-month (decode-time cutoff))
-				       parse-time-months))))
-		 cutoff))))
+		(let ((system-time-locale "C"))
+		  (upcase (format-time-string "%d-%b-%Y" cutoff))))))
 	  (and (car result)
 	       (delete 0 (mapcar #'string-to-number
 				 (cdr (assoc "SEARCH" (cdr result)))))))))))

lisp/net/pop3.el

@@ -35,7 +35,6 @@
 (eval-when-compile (require 'cl-lib))
 
 (require 'mail-utils)
-(defvar parse-time-months)
 
 (defgroup pop3 nil
   "Post Office Protocol."
@@ -609,18 +608,9 @@ Return the response string if optional second argument is non-nil."
 (defun pop3-make-date (&optional now)
   "Make a valid date header.
 If NOW, use that time instead."
-  (require 'parse-time)
-  (let* ((now (or now (current-time)))
-	 (zone (decoded-time-zone (decode-time now))))
-    (when (< zone 0)
-      (setq zone (- zone)))
-    (concat
-     (format-time-string "%d" now)
-     ;; The month name of the %b spec is locale-specific.  Pfff.
-     (format " %s "
-	     (capitalize (car (rassoc (decoded-time-month (decode-time now))
-				      parse-time-months))))
-     (format-time-string "%Y %H:%M:%S %z" now))))
+  ;; The month name of the %b spec is locale-specific.  Pfff.
+  (let ((system-time-locale "C"))
+    (format-time-string "%d %b %Y %T %z" now)))
 
 (defun pop3-munge-message-separator (start end)
   "Check to see if a message separator exists.  If not, generate one."

lisp/net/tramp-smb.el

@@ -1814,6 +1814,9 @@ Result is the list (LOCALNAME MODE SIZE MTIME)."
 	    (if (and sec min hour day month year)
 		(encode-time
 		 sec min hour day
+		 ;; FIXME: Won't this fail if parse-time-months is configured
+		 ;; by the user?  See "The date/time prompt" in the Org manual.
+		 ;; If the code is OK as-is, perhaps explain why in a comment.
 		 (cdr (assoc (downcase month) parse-time-months))
 		 year)
 	      tramp-time-dont-know))