diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index be41e12..4e922f0 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -1664,7 +1664,7 @@
 | ``%M``    | Minute as a zero-padded        | 00, 01, ..., 59        |       |
 |           | decimal number.                |                        |       |
 +-----------+--------------------------------+------------------------+-------+
-| ``%S``    | Second as a zero-padded        | 00, 01, ..., 61        | \(3)  |
+| ``%S``    | Second as a zero-padded        | 00, 01, ..., 59        | \(3)  |
 |           | decimal number.                |                        |       |
 +-----------+--------------------------------+------------------------+-------+
 | ``%f``    | Microsecond as a decimal       | 000000, 000001, ...,   | \(4)  |
@@ -1728,12 +1728,8 @@
    the output hour field if the ``%I`` directive is used to parse the hour.
 
 (3)
-   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 :meth:`strptime` input nor will it
-   produce them in :func:`strftime` output.
+   Unlike the :mod:`time` module, the :mod:`datetime` module does not support
+   leap seconds.
 
 (4)
    ``%f`` is an extension to the set of format characters in the C standard
diff --git a/Misc/NEWS b/Misc/NEWS
index d2d3b08..2aad9bb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -166,7 +166,10 @@
 Documentation
 -------------
 
+- Issue #18718: datetime documentation contradictory on leap second support.
+
 - Issue #17701: Improving strftime documentation.
+
 - Issue #17844: Refactor a documentation of Python specific encodings.
   Add links to encoders and decoders for binary-to-binary codecs.