astimezone() internals: if utcoffset() returns a duration, complain if
dst() returns None (instead of treating that as 0).
diff --git a/Misc/NEWS b/Misc/NEWS
index 0034710..e786af5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -22,6 +22,10 @@
today() and now() now round system timestamps to the closest
microsecond <http://www.python.org/sf/661086>.
+ In dt.asdatetime(tz), if tz.utcoffset(dt) returns a duration,
+ ValueError is raised of tz.dst(dt) returns None (2.3a1 treated it
+ as 0 instead).
+
Library
-------