diff --git a/attributs.py b/attributs.py
index c8f43fd..f2be07d 100644
--- a/attributs.py
+++ b/attributs.py
@@ -630,7 +630,7 @@ class generalizedTimeFormat(Attr):
             return self._stamp == othertime
         elif isinstance(othertime, int):
             return self._stamp == othertime
-        elif isinstance(othertime, unicode) or  isinstance(othertime, str):
+        elif isinstance(othertime, unicode) or isinstance(othertime, str):
             resource = generalizedTimeFormat(othertime, conn=None, Parent=None)
             return self._stamp == resource._stamp
         else:
@@ -642,9 +642,15 @@ class generalizedTimeFormat(Attr):
     def __lt__(self, othertime):
         if isinstance(othertime, generalizedTimeFormat):
             return self._stamp < othertime._stamp
-        else:
+        elif isinstance(othertime, float):
+            return self._stamp < othertime
+        elif isinstance(othertime, int):
+            return self._stamp < othertime
+        elif isinstance(othertime, unicode) or isinstance(othertime, str):
             resource = generalizedTimeFormat(othertime, conn=None, Parent=None)
             return self._stamp < resource._stamp
+        else:
+            return False
 
     def __le__(self, othertime):
         return not (self > othertime)