Clarify that datetime strftime does not produce leap seconds and datetime
strptime does not accept it in the strftime behavior section of the
datetime docs.
Closes issue 2568.
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index 0996276..5539c5a 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -1629,8 +1629,12 @@
the output hour field if the ``%I`` directive is used to parse the hour.
(3)
- The range really is ``0`` to ``61``; this accounts for leap seconds and the
- (very rare) double leap seconds.
+ The range really is ``0`` to ``61``; according to the Posix standard this
+ accounts for leap seconds and the (very rare) double leap seconds.
+ The :mod:`time` module may produce and does accept leap seconds since
+ it is based on the Posix standard, but the :mod:`datetime` module
+ does not accept leap seconds in :func:`strptime` input nor will it
+ produce them in :func:`strftime` output.
(4)
When used with the :func:`strptime` function, ``%U`` and ``%W`` are only used in