diff --git a/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.0.0.xml b/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
index 85f8334754a4..f971118ce42b 100644
--- a/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
+++ b/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
@@ -26,6 +26,7 @@ under the License.
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <project.build.outputTimestamp>2001-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
   <build>
diff --git a/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.1.0.xml b/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
index 85f8334754a4..f971118ce42b 100644
--- a/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
+++ b/maven-api-impl/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
@@ -26,6 +26,7 @@ under the License.
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <project.build.outputTimestamp>2001-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
   <build>
diff --git a/maven-core/src/test/java/org/apache/maven/project/PomConstructionTest.java b/maven-core/src/test/java/org/apache/maven/project/PomConstructionTest.java
index c1d6a8ad3ecd..a72825788114 100644
--- a/maven-core/src/test/java/org/apache/maven/project/PomConstructionTest.java
+++ b/maven-core/src/test/java/org/apache/maven/project/PomConstructionTest.java
@@ -1228,7 +1228,7 @@ void testReportingPluginConfig() throws Exception {
     @Test
     void testPropertiesNoDuplication() throws Exception {
         PomTestWrapper pom = buildPom("properties-no-duplication/sub");
-        assertEquals(3, ((Properties) pom.getValue("properties")).size());
+        assertEquals(4, ((Properties) pom.getValue("properties")).size());
         assertEquals("child", pom.getValue("properties/pomProfile"));
     }
 
@@ -1351,10 +1351,11 @@ private void testCompleteModel(PomTestWrapper pom) throws Exception {
         assertEquals(1, ((List<?>) pom.getValue("modules")).size());
         assertEquals("sub", pom.getValue("modules[1]"));
 
-        assertEquals(3, ((Map<?, ?>) pom.getValue("properties")).size());
+        assertEquals(4, ((Map<?, ?>) pom.getValue("properties")).size());
         assertEquals("project-property", pom.getValue("properties[1]/itProperty"));
         assertEquals("UTF-8", pom.getValue("properties[1]/project.build.sourceEncoding"));
         assertEquals("UTF-8", pom.getValue("properties[1]/project.reporting.outputEncoding"));
+        assertEquals("2001-01-01T00:00:00Z", pom.getValue("properties[1]/project.build.outputTimestamp"));
 
         assertEquals(1, ((List<?>) pom.getValue("dependencyManagement/dependencies")).size());
         assertEquals("org.apache.maven.its", pom.getValue("dependencyManagement/dependencies[1]/groupId"));
diff --git a/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.0.0.xml b/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
index 85f8334754a4..f971118ce42b 100644
--- a/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
+++ b/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.0.0.xml
@@ -26,6 +26,7 @@ under the License.
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <project.build.outputTimestamp>2001-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
   <build>
diff --git a/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.1.0.xml b/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
index 85f8334754a4..f971118ce42b 100644
--- a/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
+++ b/maven-model-builder/src/main/resources/org/apache/maven/model/pom-4.1.0.xml
@@ -26,6 +26,7 @@ under the License.
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <project.build.outputTimestamp>2001-01-01T00:00:00Z</project.build.outputTimestamp>
   </properties>
 
   <build>