Issue #14448: merge with 3.2
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index 401a647..27197b8 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -1557,7 +1557,6 @@
.. literalinclude:: ../includes/tzinfo-examples.py
-
Note that there are unavoidable subtleties twice per year in a :class:`tzinfo`
subclass accounting for both standard and daylight time, at the DST transition
points. For concreteness, consider US Eastern (UTC -0500), where EDT begins the
@@ -1597,6 +1596,15 @@
or any other fixed-offset :class:`tzinfo` subclass (such as a class representing
only EST (fixed offset -5 hours), or only EDT (fixed offset -4 hours)).
+.. seealso::
+
+ `pytz <http://pypi.python.org/pypi/pytz/>`_
+ The Standard Library has no :class:`tzinfo` instances except for UTC, but
+ it exists a third-party library which brings Olson timezone database to
+ Python: `pytz`.
+
+ `pytz` contains up-to-date information and its usage is recommended.
+
.. _datetime-timezone: