Patch #1646728: datetime.fromtimestamp fails with negative
fractional times.  With unittest.
  (backport from rev. 54167 by Guido)
diff --git a/Misc/NEWS b/Misc/NEWS
index 3cefca9..c51b690 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -118,6 +118,9 @@
 Extension Modules
 -----------------
 
+- Patch #1646728: datetime.fromtimestamp fails with negative
+  fractional times.  With unittest.
+
 - Patch #1494140: Add documentation for the new struct.Struct object.
 
 - Patch #1657276: Make NETLINK_DNRTMSG conditional.