diff --git a/pom.xml b/pom.xml
index 340049c..dc25aeb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -197,6 +197,18 @@
 			<version>4.13.1</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.github.stefanbirkner</groupId>
+			<artifactId>system-rules</artifactId>
+			<version>1.19.0</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.github.stefanbirkner</groupId>
+			<artifactId>system-lambda</artifactId>
+			<version>1.1.0</version>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
diff --git a/src/main/java/org/redline_rpm/Builder.java b/src/main/java/org/redline_rpm/Builder.java
index 0639157..fc89cb8 100644
--- a/src/main/java/org/redline_rpm/Builder.java
+++ b/src/main/java/org/redline_rpm/Builder.java
@@ -102,7 +102,17 @@ public class Builder {
 	 */
 	public Builder() {
 		format.getHeader().createEntry( HEADERI18NTABLE, "C");
-		format.getHeader().createEntry( BUILDTIME, ( int) ( System.currentTimeMillis() / 1000));
+		long sourceDateEpoch=0;
+		long buildTime = System.currentTimeMillis()/1000;
+		try {
+			sourceDateEpoch = Long.parseLong(System.getenv("SOURCE_DATE_EPOCH"));
+		}catch(NumberFormatException e) {
+			// do nothing
+		}
+		if(sourceDateEpoch!=0){
+			buildTime = sourceDateEpoch;
+		}
+		format.getHeader().createEntry( BUILDTIME, ( int)buildTime);
 		format.getHeader().createEntry( RPMVERSION, "4.4.2");
 		format.getHeader().createEntry( PAYLOADFORMAT, "cpio");
 		format.getHeader().createEntry( PAYLOADCOMPRESSOR, "gzip");
diff --git a/src/test/java/org/redline_rpm/BuilderTest.java b/src/test/java/org/redline_rpm/BuilderTest.java
index 22536e6..9ef4a91 100644
--- a/src/test/java/org/redline_rpm/BuilderTest.java
+++ b/src/test/java/org/redline_rpm/BuilderTest.java
@@ -1,7 +1,8 @@
 package org.redline_rpm;
 
+import org.junit.Rule;
 import org.junit.Test;
-import org.redline_rpm.Scanner;
+import org.junit.contrib.java.lang.system.EnvironmentVariables;
 import org.redline_rpm.header.Format;
 import org.redline_rpm.header.Header.HeaderTag;
 import org.redline_rpm.header.Header;
@@ -23,6 +24,9 @@
 
 public class BuilderTest extends TestBase {
 
+    @Rule
+    public final EnvironmentVariables environmentVariables = new EnvironmentVariables();
+    
     @Test
     public void testLongNameTruncation() throws Exception {
         Builder builder = new Builder();
@@ -205,6 +209,27 @@ public void testProvideOverride() throws Exception {
 
     }
 
+    /**
+     * Allows the Build Date of the RPM to be overridden by the environment variable SOURCE_DATE_EPOCH
+     * See https://reproducible-builds.org/docs/source-date-epoch/
+     * @throws Exception
+     */
+    @Test
+    public void testReproducibleBuilds() throws Exception {
+        final String EXPECTED_BUILD_TIME="1644516016";
+        environmentVariables.set("SOURCE_DATE_EPOCH", EXPECTED_BUILD_TIME);
+
+        Builder builder = new Builder();
+        builder.setPackage("testReproducibleBuilds", "1.0", "1");
+        builder.build( new File( getTargetDir()));
+
+        Format format = new Scanner().run(channelWrapper("target" + File.separator + "testReproducibleBuilds-1.0-1.noarch.rpm"));
+        System.out.println(EXPECTED_BUILD_TIME+" hhhhhh ==" + format.getHeader().getEntry(HeaderTag.BUILDTIME).toString());
+    
+        assertEquals("buildtime[tag=1006,type=4,count=1,size=4,offset=36]\n\t"+EXPECTED_BUILD_TIME+", ", format.getHeader().getEntry(HeaderTag.BUILDTIME).toString());
+
+    }
+
     @Test
     public void testAddHeaderEntry() {
     	Builder builder = new Builder();