Raise exception with message; not tuple

Signed-off-by: Ivan Kanakarakis <[email protected]>

Author: c00kiemon5ter

src/saml2/httpbase.py

@@ -84,9 +84,10 @@ def _since_epoch(cdate):
             break
 
     if t == -1:
-        raise (Exception,
-               'ValueError: Date "{0}" does not match any of: {1}'.format(
-                   cdate,TIME_FORMAT))
+        err = 'ValueError: Date "{0}" does not match any of: {1}'.format(
+            cdate, TIME_FORMAT
+        )
+        raise Exception(err)
 
     return calendar.timegm(t)