diff --git a/antlr3.changes b/antlr3.changes
index e38dde8..9583b3e 100644
--- a/antlr3.changes
+++ b/antlr3.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Sep 15 08:19:19 UTC 2023 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Override build date (boo#1047218)"
+
 -------------------------------------------------------------------
 Fri Mar 17 06:55:33 UTC 2023 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/antlr3.spec b/antlr3.spec
index 86b48ca..c45ca35 100644
--- a/antlr3.spec
+++ b/antlr3.spec
@@ -128,7 +128,7 @@ BuildArch:      noarch
 %pom_remove_plugin :antlr3-maven-plugin tool
 %endif
 
-sed -i "s,\${buildNumber},`cat %{_sysconfdir}/fedora-release` `date`," tool/src/main/resources/org/antlr/antlr.properties
+sed -i "s,\${buildNumber},`cat %{_sysconfdir}/fedora-release` `date -u -d@${SOURCE_DATE_EPOCH:-$(date +%%s)}`," tool/src/main/resources/org/antlr/antlr.properties
 %patch0 -p1
 %patch1