From 53aadec17499c54e84d8925128cfc78bc13cac6d Mon Sep 17 00:00:00 2001 From: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com> Date: Thu, 12 Feb 2026 10:35:42 +0000 Subject: [PATCH] gh-57095: Add note about input splitting in `datetime.*.strptime` (GH-131049) (cherry picked from commit 2e3e76e5cde34786780f5b3723f495fdbdf37c84) Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com> Co-authored-by: Petr Viktorin --- Doc/library/datetime.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst index 64356c9b6b0472..ea7904fe6d6d49 100644 --- a/Doc/library/datetime.rst +++ b/Doc/library/datetime.rst @@ -2591,6 +2591,12 @@ For the :meth:`.datetime.strptime` class method, the default value is ``1900-01-01T00:00:00.000``: any components not specified in the format string will be pulled from the default value. +.. note:: + Format strings without separators can be ambiguous for parsing. For + example, with ``%Y%m%d``, the string ``2026111`` may be parsed either as + ``2026-11-01`` or as ``2026-01-11``. + Use separators to ensure the input is parsed as intended. + .. note:: When used to parse partial dates lacking a year, :meth:`.datetime.strptime` will raise when encountering February 29 because the default year of 1900 is