Hi, I created a patch to fix this auto test issue with Python 3.12. I am attaching the debdiff file for you to checkout.
I have created a branch too in the salsa [0], if it looks ok, you can MR. [0] https://salsa.debian.org/python-team/packages/python-docx/-/tree/fix-for-auto-test-error-Py312?ref_type=heads Cheers!
diff -Nru python-docx-1.1.0+dfsg/debian/changelog python-docx-1.1.0+dfsg/debian/changelog --- python-docx-1.1.0+dfsg/debian/changelog 2023-11-22 06:24:08.000000000 +0000 +++ python-docx-1.1.0+dfsg/debian/changelog 2024-01-13 20:00:00.000000000 +0000 @@ -1,3 +1,11 @@ +python-docx (1.1.0+dfsg-2) UNRELEASED; urgency=medium + + * Team upload. + * Patch for dh_auto_test datetime DeprecationWarning with + Python 3.12. (Closes: #1058441) + + -- Yogeswaran Umasankar <kd8...@gmail.com> Sat, 13 Jan 2024 20:00:00 +0000 + python-docx (1.1.0+dfsg-1) unstable; urgency=medium * New upstream version 1.1.0+dfsg diff -Nru python-docx-1.1.0+dfsg/debian/patches/fix-DescribeCorePropertiesPart-py312.patch python-docx-1.1.0+dfsg/debian/patches/fix-DescribeCorePropertiesPart-py312.patch --- python-docx-1.1.0+dfsg/debian/patches/fix-DescribeCorePropertiesPart-py312.patch 1970-01-01 00:00:00.000000000 +0000 +++ python-docx-1.1.0+dfsg/debian/patches/fix-DescribeCorePropertiesPart-py312.patch 2024-01-13 20:00:00.000000000 +0000 @@ -0,0 +1,56 @@ +Description: Fixed datetime DeprecationWarning in Python 3.12. + Issue caused because modified_datetime returns None. +Author: Yogeswaran Umasankar <kd8...@gmail.com> +Last-Update: 2024-01-08 + +--- a/src/docx/opc/parts/coreprops.py ++++ b/src/docx/opc/parts/coreprops.py +@@ -1,6 +1,6 @@ + """Core properties part, corresponds to ``/docProps/core.xml`` part in package.""" + +-from datetime import datetime ++from datetime import datetime, timezone + + from docx.opc.constants import CONTENT_TYPE as CT + from docx.opc.coreprops import CoreProperties +@@ -22,7 +22,7 @@ class CorePropertiesPart(XmlPart): + core_properties.title = "Word Document" + core_properties.last_modified_by = "python-docx" + core_properties.revision = 1 +- core_properties.modified = datetime.utcnow() ++ core_properties.modified = datetime.now(timezone.utc) + return core_properties_part + + @property +--- a/tests/opc/parts/test_coreprops.py ++++ b/tests/opc/parts/test_coreprops.py +@@ -1,6 +1,6 @@ + """Unit test suite for the docx.opc.parts.coreprops module.""" + +-from datetime import datetime, timedelta ++from datetime import datetime, timedelta, timezone + + import pytest + +@@ -25,7 +25,8 @@ class DescribeCorePropertiesPart: + assert core_properties.title == "Word Document" + assert core_properties.last_modified_by == "python-docx" + assert core_properties.revision == 1 +- delta = datetime.utcnow() - core_properties.modified ++ # Handles if modified_datetime is None ++ delta = datetime.now(timezone.utc) - (core_properties.modified.replace(tzinfo=timezone.utc) if core_properties.modified else None) + max_expected_delta = timedelta(seconds=2) + assert delta < max_expected_delta + +--- a/src/docx/opc/coreprops.py ++++ b/src/docx/opc/coreprops.py +@@ -93,7 +93,8 @@ class CoreProperties: + + @property + def modified(self): +- return self._element.modified_datetime ++ # Handles if modified_datetime is None ++ return self._element.modified_datetime if self._element.modified_datetime is not None else None + + @modified.setter + def modified(self, value): diff -Nru python-docx-1.1.0+dfsg/debian/patches/series python-docx-1.1.0+dfsg/debian/patches/series --- python-docx-1.1.0+dfsg/debian/patches/series 2023-11-22 06:21:09.000000000 +0000 +++ python-docx-1.1.0+dfsg/debian/patches/series 2024-01-13 20:00:00.000000000 +0000 @@ -1 +1,2 @@ +fix-DescribeCorePropertiesPart-py312.patch adjust-to-image-removals.patch