diff --git a/lisp/org.el b/lisp/org.el
index 3df694eeb..4de5ca064 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -23813,7 +23813,8 @@ time-range, if possible.
 When optional argument UTC is non-nil, time will be expressed as
 Universal Time."
   (format-time-string
-   format (org-timestamp--to-internal-time timestamp end) utc))
+   format (org-timestamp--to-internal-time timestamp end)
+   (and utc t)))
 
 (defun org-timestamp-split-range (timestamp &optional end)
   "Extract a TIMESTAMP object from a date or time range.
diff --git a/lisp/ox-icalendar.el b/lisp/ox-icalendar.el
index f965ddcf1..11fc587fd 100644
--- a/lisp/ox-icalendar.el
+++ b/lisp/ox-icalendar.el
@@ -396,7 +396,8 @@ Universal Time, ignoring `org-icalendar-date-time-format'."
       ;; Convert timestamp into internal time in order to use
       ;; `format-time-string' and fix any mistake (i.e. MI >= 60).
       (encode-time 0 mi h d m y)
-      (or utc (and with-time-p (org-icalendar-use-UTC-date-time-p)))))))
+      (and (or utc (and with-time-p (org-icalendar-use-UTC-date-time-p)))
+	   t)))))
 
 (defun org-icalendar-dtstamp ()
   "Return DTSTAMP property, as a string."