Simplify use of timestamps

* lisp/calendar/icalendar.el (icalendar--create-uid):
* lisp/gnus/nnmaildir.el (nnmaildir-request-accept-article):
Simplify by using format-time-string.
* lisp/gnus/nnmaildir.el (nnmaildir--scan):
Simplify by using float-time and time-less-p.

2 files changed, 4 insertions, 8 deletions

diff --git a/lisp/calendar/icalendar.el b/lisp/calendar/icalendar.el
index c1a3e0a4213..e3e458a4dd7 100644
--- a/lisp/calendar/icalendar.el
+++ b/lisp/calendar/icalendar.el
@@ -1016,9 +1016,7 @@ current iCalendar object, as a string.  Increase
       (setq icalendar--uid-count (1+ icalendar--uid-count))
       (setq uid (replace-regexp-in-string
                  "%t"
-                 (format "%d%d%d" (car (current-time))
-                         (cadr (current-time))
-                         (car (cddr (current-time))))
+                 (format-time-string "%s%N")
                  uid t t))
       (setq uid (replace-regexp-in-string
                  "%h"
diff --git a/lisp/gnus/nnmaildir.el b/lisp/gnus/nnmaildir.el
index c8480ddda4c..48a470c7462 100644
--- a/lisp/gnus/nnmaildir.el
+++ b/lisp/gnus/nnmaildir.el
@@ -764,7 +764,7 @@ This variable is set by `nnmaildir-request-article'.")
 
 (defun nnmaildir--scan (gname scan-msgs groups _method srv-dir srv-ls)
   (catch 'return
-    (let ((36h-ago (- (car (current-time)) 2))
+    (let ((36h-ago (- (float-time) 129600))
           absdir nndir tdir ndir cdir nattr cattr isnew pgname read-only ls
           files num dir flist group x)
       (setq absdir (nnmaildir--srvgrp-dir srv-dir gname)
@@ -801,7 +801,7 @@ This variable is set by `nnmaildir-request-article'.")
           (throw 'return nil))
         (dolist (file (funcall ls tdir 'full "\\`[^.]" 'nosort))
           (setq x (file-attributes file))
-          (if (or (> (cadr x) 1) (< (car (nth 4 x)) 36h-ago))
+          (if (or (> (cadr x) 1) (time-less-p (nth 4 x) 36h-ago))
               (delete-file file))))
       (or scan-msgs
           isnew
@@ -1463,9 +1463,7 @@ This variable is set by `nnmaildir-request-article'.")
       (unless (string-equal nnmaildir--delivery-time file)
         (setq nnmaildir--delivery-time file
               nnmaildir--delivery-count 0))
-      (when (and (consp (cdr time))
-                 (consp (cddr time)))
-        (setq file (concat file "M" (number-to-string (caddr time)))))
+      (setq file (concat file (format-time-string "M%6N" time)))
       (setq file (concat file nnmaildir--delivery-pid)
             file (concat file "Q" (number-to-string nnmaildir--delivery-count))
             file (concat file "." (nnmaildir--system-name))