--- /tmp/date.py	2004-07-20 14:45:42.212788495 -0400
+++ date.py	2004-07-20 14:45:32.972449000 -0400
@@ -123,6 +123,9 @@
             return
         elif hasattr(spec, 'tuple'):
             spec = spec.tuple()
+        elif isinstance(spec, Date):
+            self.set(spec.formal(), offset=offset, add_granularity=add_granularity)
+	    return
         try:
             y,m,d,H,M,S,x,x,x = spec
             frac = S - int(S)