diff --git a/libdb_java-4_8.changes b/libdb_java-4_8.changes
index 9afbec0..ffadd75 100644
--- a/libdb_java-4_8.changes
+++ b/libdb_java-4_8.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Jul 16 07:01:52 UTC 2024 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Add reproducible.patch to set .jar mtime to a constant.
+
 -------------------------------------------------------------------
 Wed Jun 21 12:42:57 UTC 2023 - Pedro Monreal <pmonreal@suse.com>
 
diff --git a/libdb_java-4_8.spec b/libdb_java-4_8.spec
index 03740c8..1ea08ab 100644
--- a/libdb_java-4_8.spec
+++ b/libdb_java-4_8.spec
@@ -33,6 +33,7 @@ Patch0:         db-%{version}.patch
 Patch1:         libdb_java-4_8-fix-java10-comp.patch
 # PATCH-FIX-OPENSUSE Fix build with GCC8, conflict with reserved builtin name
 Patch2:         libdb-fix-atomic.patch
+Patch3:         reproducible.patch
 BuildRequires:  autoconf
 BuildRequires:  gcc-c++
 BuildRequires:  java-sdk >= 1.8
@@ -64,6 +65,10 @@ These are the development files.
 %patch -P 0
 %patch -P 1 -p1
 %patch -P 2
+# the Leap build happens with an old jar version that does not know the --date option, so we need to test for that
+if jar --help|grep -q -- --date=TIMESTAMP ; then
+%patch -P 3 -p1
+fi
 
 %build
 cd dist
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..ec2ebcc
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,19 @@
+Date: 2024-07-16
+Author: Bernhard M. Wiedemann
+
+make .jar build reproducible
+by setting the build date to a constant.
+
+Index: db-4.8.30/dist/Makefile.in
+===================================================================
+--- db-4.8.30.orig/dist/Makefile.in
++++ db-4.8.30/dist/Makefile.in
+@@ -830,7 +830,7 @@ $(libj_jarfile): $(JAVA_DBSRCS)
+ 	$(JAVA) -classpath $(JAVA_CLASSTOP) \
+ 	    com.sleepycat.persist.model.ClassEnhancer $(JAVA_CLASSTOP)
+ 	cd $(JAVA_CLASSTOP) && \
+-	     $(JAR) cfm ../$(libj_jarfile) ../$(JAVA_MANIFEST) ./com/sleepycat
++	     $(JAR) --date=2000-01-01T00:00:00+00:00 -c -f ../$(libj_jarfile) -m ../$(JAVA_MANIFEST) ./com/sleepycat
+ 
+ $(libj_exjarfile): $(libj_jarfile) $(JAVA_EXSRCS)
+ 	@test -d $(JAVA_EXCLASSTOP) || \