1 files changed, 2 insertions, 1 deletions
diff --git a/utils.lisp b/utils.lisp
index 90cfb8b..f874323 100644
--- a/utils.lisp
+++ b/utils.lisp
@@ -329,7 +329,8 @@ ELEMENT-TYPE as the stream's."
 (defun revalidate-cache-or-die ()
   #+clisp
     (when *if-modified-since*
-      (let ((time (cybertiggyr-time:parse-time *if-modified-since*)))
+      (let* ((date-recognisers (mapcar #'cybertiggyr-time::make-fmt-recognizer '("%A, %d-%B-%y %H:%M:%S GMT" "%A, %d %B %Y %H:%M:%S GMT" "%A %B %d %H:%M:%S %Y")))
+             (time (cybertiggyr-time:parse-time *if-modified-since* date-recognizers)))
         (when (and (integerp time) (>= *if-modified-since* (compute-journal-last-modified-date)))
           (http-add-header "Status: 304 Not Modified")
           (http-send-headers)