Fix long standing bug in date shown for kobo books

src/calibre/devices/kobo/books.py

@@ -44,10 +44,11 @@ class Book(MetaInformation):
         self.mime = mime
 
         self.size = size # will be set later if None
-        try:
+
         if ContentType == '6':
             self.datetime = time.strptime(date, "%Y-%m-%dT%H:%M:%S.%f")
         else:
+            try:
                 self.datetime = time.gmtime(os.path.getctime(self.path))
             except:
                 self.datetime = time.gmtime()