pganssle · Oct 25, 2026 · Oct 23, 2026
diff --git a/RELEASING b/RELEASING
@@ -1,6 +1,6 @@
 Release Checklist
 -----------------------------------------
-[ ] Update classifiers in setup.cfg to include the latest supported Python
+[ ] Update classifiers in pyproject.toml to include the latest supported Python
     versions.
 [ ] Update NEWS with list of changes:
     [ ] Invoke `tox -e news -- --version <NEXT_VERSION>`

diff --git a/changelog.d/1637.misc.rst b/changelog.d/1637.misc.rst
@@ -0,0 +1,2 @@
+Moved package metadata and pytest configuration to pyproject.toml.
+Fixed by @pganssle (gh pr #1637).
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,10 +1,44 @@
 [build-system]
-requires = [
-    "setuptools",
-    "setuptools_scm<8.0"
-]
+requires = ["setuptools>=77", "setuptools_scm<8.0"]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "python-dateutil"
+description = "Extensions to the standard Python datetime module"
+dynamic = ["version", "readme"]
+requires-python = ">=3.11"
+dependencies = ["tzdata"]
+license = "BSD-3-Clause"
+license-files = ["LICENSE", "AUTHORS.md"]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
+    "Programming Language :: Python :: Free Threading :: 2 - Beta",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+    "Topic :: Software Development :: Libraries",
+]
+
+[[project.authors]]
+name = "Gustavo Niemeyer"
+email = "gustavo@niemeyer.net"
+
+[[project.maintainers]]
+name = "Paul Ganssle"
+email = "dateutil@python.org"
+
+[project.urls]
+Homepage = "https://github.com/dateutil/dateutil"
+Documentation = "https://dateutil.readthedocs.io/en/stable/"
+Source = "https://github.com/dateutil/dateutil"
+
 [tool.towncrier]
     package = "dateutil"
     package_dir = "dateutil"
@@ -60,3 +94,37 @@ known_third_party=[
 multi_line_output=3
 use_parentheses=true
 
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools_scm]
+write_to = "src/dateutil/_version.py"
+
+[tool.pytest.ini_options]
+python_files = [
+    "test_*.py",
+    "*_test.py",
+    "*_solution.py",
+]
+xfail_strict = true
+filterwarnings = [
+    "error",
+    "error::DeprecationWarning",
+    "error::PendingDeprecationWarning",
+]
+markers = [
+    "gettz",
+    "import_star",
+    "isoparser",
+    "parserinfo",
+    "rrule",
+    "rruleset",
+    "rrulestr",
+    "smoke",
+    "tz_resolve_imaginary",
+    "tzdata_properties",
+    "tzfile",
+    "tzlocal",
+    "tzoffset",
+    "tzstr",
+]
diff --git a/setup.cfg b/setup.cfg
diff --git a/setup.py b/setup.py
@@ -20,10 +20,4 @@ def README():
 README = README()  # NOQA
 
 
-setup(
-      use_scm_version={
-          'write_to': 'src/dateutil/_version.py',
-      },
-      ## Needed since doctest not supported by PyPA.
-      long_description = README,
-      )
+setup(long_description=README, long_description_content_type="text/x-rst")
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Moved package metadata and pytest configuration to pyproject.toml.
		Fixed by @pganssle (gh pr #1637).