diff --git a/python-quantities.changes b/python-quantities.changes
index fb67cb3..519ce2f 100644
--- a/python-quantities.changes
+++ b/python-quantities.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sun Oct 15 17:48:09 UTC 2023 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Add reproducible.patch to drop build date (boo#1047218)
+
 -------------------------------------------------------------------
 Wed May 31 08:28:44 UTC 2023 - Dirk Müller <dmueller@suse.com>
 
diff --git a/python-quantities.spec b/python-quantities.spec
index feea9d8..6f7469b 100644
--- a/python-quantities.spec
+++ b/python-quantities.spec
@@ -23,6 +23,7 @@ Summary:        Package for physical quantities with units
 License:        BSD-3-Clause
 URL:            https://github.com/python-quantities/python-quantities/
 Source:         https://files.pythonhosted.org/packages/source/q/quantities/quantities-%{version}.tar.gz
+Patch0:         reproducible.patch
 BuildRequires:  %{python_module base >= 3.7}
 BuildRequires:  %{python_module numpy >= 1.16}
 BuildRequires:  %{python_module pip}
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..ca24687
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,24 @@
+https://github.com/python-quantities/python-quantities/issues/225
+
+Drop date from generated files for reproducible builds.
+
+Index: quantities-0.14.1/setup.py
+===================================================================
+--- quantities-0.14.1.orig/setup.py
++++ quantities-0.14.1/setup.py
+@@ -1,7 +1,6 @@
+ from setuptools import Command, setup
+ from setuptools.command.build_py import build_py as _build
+ from setuptools.command.sdist import sdist as _sdist
+-from datetime import datetime
+ 
+ 
+ class data(Command):
+@@ -24,7 +23,6 @@ class data(Command):
+         with open('quantities/constants/_codata.py', 'w') as f:
+             f.write('# THIS FILE IS AUTOMATICALLY GENERATED\n')
+             f.write('# ANY CHANGES MADE HERE WILL BE LOST\n')
+-            f.write(f'# LAST GENERATED: {datetime.now()}\n\n')
+             f.write('physical_constants = {}\n\n')
+             for line in data:
+                 name = line[:55].rstrip().replace('mag.','magnetic')