diff --git a/0001-Fix-integer-overflow-when-parsing-SOURCE_DATE_EPOCH.patch b/0001-Fix-integer-overflow-when-parsing-SOURCE_DATE_EPOCH.patch
new file mode 100644
index 0000000..a3f9ccf
--- /dev/null
+++ b/0001-Fix-integer-overflow-when-parsing-SOURCE_DATE_EPOCH.patch
@@ -0,0 +1,68 @@
+From 750924c556fbb0c431e983ec57befb9a7f070685 Mon Sep 17 00:00:00 2001
+From: Marian Koncek <mkoncek@redhat.com>
+Date: Fri, 3 Jun 2022 12:43:45 +0200
+Subject: [PATCH] Fix integer overflow when parsing SOURCE_DATE_EPOCH
+
+Upstream: https://github.com/apache/ant/pull/186/commits
+
+---
+ .../org/apache/tools/ant/taskdefs/Tstamp.java |  2 +-
+ src/tests/antunit/taskdefs/tstamp-test.xml    | 31 +++++++++++++++++++
+ 2 files changed, 32 insertions(+), 1 deletion(-)
+
+diff --git a/src/main/org/apache/tools/ant/taskdefs/Tstamp.java b/src/main/org/apache/tools/ant/taskdefs/Tstamp.java
+index aa1034e..ca10efe 100644
+--- a/src/main/org/apache/tools/ant/taskdefs/Tstamp.java
++++ b/src/main/org/apache/tools/ant/taskdefs/Tstamp.java
+@@ -82,7 +82,7 @@ public class Tstamp extends Task {
+             try {
+                 if (epoch != null) {
+                     // Value of SOURCE_DATE_EPOCH will be an integer, representing seconds.
+-                    d = new Date(Integer.parseInt(epoch) * 1000);
++                    d = new Date(Long.parseLong(epoch) * 1000L);
+                     log("Honouring environment variable " + ENV_SOURCE_DATE_EPOCH + " which has been set to " + epoch);
+                 }
+             } catch(NumberFormatException e) {
+diff --git a/src/tests/antunit/taskdefs/tstamp-test.xml b/src/tests/antunit/taskdefs/tstamp-test.xml
+index 20c3227..1553d32 100644
+--- a/src/tests/antunit/taskdefs/tstamp-test.xml
++++ b/src/tests/antunit/taskdefs/tstamp-test.xml
+@@ -75,4 +75,35 @@ public class IsEpochIn1969Here implements Condition {
+     <!-- 'iso' overrides 'simple' -->
+     <au:assertPropertyEquals name="DSTAMP" value="19720417"/>
+   </target>
++
++  <target name="testSourceDateEpoch">
++    <mkdir dir="${input}"/>
++    <mkdir dir="${output}"/>
++    <echo file="${input}/TstampAntunitTest.java"><![CDATA[
++      import org.apache.tools.ant.*;
++      import org.apache.tools.ant.taskdefs.*;
++      public class TstampAntunitTest {
++        public static void main(String[] args) {
++          Task task = new Tstamp();
++          task.setProject(new Project());
++          task.execute();
++          String today = task.getProject().getProperty("TODAY");
++          System.out.println("TODAY is " + today);
++        }
++      }
++    ]]></echo>
++    <javac srcdir="${input}" destdir="${output}"/>
++    <local name="testout"/>
++    <java classname="TstampAntunitTest"
++          failonerror="true"
++          outputproperty="testout"
++          fork="true">
++      <classpath>
++        <pathelement location="${output}"/>
++        <pathelement path="${java.class.path}"/>
++      </classpath>
++      <env key="SOURCE_DATE_EPOCH" value="1650585600"/>
++    </java>
++    <au:assertEquals expected="TODAY is April 22 2022" actual="${testout}"/>
++  </target>
+ </project>
+-- 
+2.35.1
+
diff --git a/ant.spec b/ant.spec
index 796cbdb..e97d426 100644
--- a/ant.spec
+++ b/ant.spec
@@ -34,7 +34,7 @@
 
 Name:           ant
 Version:        1.10.12
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Java build tool
 Summary(it):    Tool per la compilazione di programmi java
 Summary(fr):    Outil de compilation pour java
@@ -49,6 +49,7 @@ Source2:        apache-ant-1.8.ant.conf
 Source3:        ant.asciidoc
 
 Patch0:         %{name}-build.xml.patch
+Patch1:         0001-Fix-integer-overflow-when-parsing-SOURCE_DATE_EPOCH.patch
 
 BuildRequires:  asciidoc
 BuildRequires:  xmlto
@@ -328,6 +329,7 @@ Javadoc pour %{name}.
 %prep
 %setup -q -n apache-ant-%{version}
 %patch0 -p0
+%patch1 -p1
 
 # clean jar files
 find . -name "*.jar" | xargs -t rm
@@ -640,6 +642,9 @@ LC_ALL=C.UTF-8 %{ant} test
 # -----------------------------------------------------------------------------
 
 %changelog
+* Fri Jun 03 2022 Marian Koncek <mkoncek@redhat.com> - 1.10.12-5
+- Fix integer overflow when parsing SOURCE_DATE_EPOCH
+
 * Fri Apr 22 2022 Mikolaj Izdebski <mizdebsk@redhat.com> - 1.10.12-4
 - Fix FTBFS with JUnit 5.8.x