diff --git a/WHATSNEW b/WHATSNEW
index f93d0af2b..096cd341d 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -6,6 +6,8 @@ Other changes:
  * generatekey task now supports SubjectAlternativeName during key
    generation.
 
+ * the <modified> selector has a new built-in algorithm 'lastmodified'
+   which computes a value based upon the lastmodified time of the file.
 
 Changes from Ant 1.10.4 TO Ant 1.10.5
 =====================================
@@ -62,7 +64,7 @@ Fixed bugs:
  * <cab> died with a NullPointerException since Ant 1.10.2.
    Bugzilla Report 62335
 
- * The <depend> task would fail with 
+ * The <depend> task would fail with
    "java.lang.ClassFormatError: Invalid Constant Pool entry Type 19" while
    parsing a module-info.class. The task is compatible with
    Java bytecode version 53 now.
diff --git a/manual/Types/selectors.html b/manual/Types/selectors.html
index ca2213a71..93d87f050 100644
--- a/manual/Types/selectors.html
+++ b/manual/Types/selectors.html
@@ -633,6 +633,7 @@
             <li><q>hashvalue</q>&mdash;HashvalueAlgorithm</li>
             <li><q>digest</q>&mdash;DigestAlgorithm</li>
             <li><q>checksum</q>&mdash;ChecksumAlgorithm</li>
+            <li><q>lastmodified</q>&mdash;LastModifiedAlgorithm</li>
           </ul>
         </td>
         <td>No; defaults to <q>digest</q></td>
@@ -747,6 +748,10 @@
          </ul>
        </td>
      </tr>
+     <tr>
+       <td>lastmodified</td>
+       <td>Uses the lastModified property of a file. No additional configuration is required.</td>
+     </tr>
     </table>
     <h6>cache</h6>
     <p>Same as <var>cache</var> attribute, with the following additional values:</p>
diff --git a/src/main/org/apache/tools/ant/types/selectors/modifiedselector/LastModifiedAlgorithm.java b/src/main/org/apache/tools/ant/types/selectors/modifiedselector/LastModifiedAlgorithm.java
new file mode 100644
index 000000000..af8358a64
--- /dev/null
+++ b/src/main/org/apache/tools/ant/types/selectors/modifiedselector/LastModifiedAlgorithm.java
@@ -0,0 +1,53 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package org.apache.tools.ant.types.selectors.modifiedselector;
+
+import java.io.File;
+
+/**
+ * Computes a 'timestamp' of file based on the lastModified time of that file.
+ *
+ * @version 2018-07-25
+ * @since  Ant 1.10.6 and 1.9.14
+ */
+public class LastModifiedAlgorithm implements Algorithm {
+
+    /**
+     * This algorithm doesn't need any configuration.
+     * Therefore it's always valid.
+     * @return always true
+     */
+    public boolean isValid() {
+        return true;
+    }
+
+    /**
+     * Computes a 'timestamp' for a file based on the lastModified time.
+     * @param file  The file for which the value should be computed
+     * @return the timestamp or <i>null</i> if the timestamp couldn't be computed
+     */
+    public String getValue(File file) {
+        long lastModified = file.lastModified();
+        if (lastModified == 0L) {
+            return null;
+        }
+
+        return Long.toString(lastModified);
+    }
+}
diff --git a/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ModifiedSelector.java b/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ModifiedSelector.java
index 30c28ec06..181642c14 100644
--- a/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ModifiedSelector.java
+++ b/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ModifiedSelector.java
@@ -325,6 +325,8 @@ public class ModifiedSelector extends BaseExtendSelector
                 algorithm = new DigestAlgorithm();
             } else if ("checksum".equals(algoName.getValue())) {
                 algorithm = new ChecksumAlgorithm();
+            } else if ("lastmodified".equals(algoName.getValue())) {
+                algorithm = new LastModifiedAlgorithm();
             }
         } else if (algorithmClass != null) {
             // use Algorithm specified by classname
@@ -913,7 +915,7 @@ public class ModifiedSelector extends BaseExtendSelector
 
     /**
      * The enumerated type for algorithm.
-     * The values are "hashValue", "digest" and "checksum".
+     * The values are "hashValue", "digest", "checksum" and "lastmodified".
      */
     public static class AlgorithmName extends EnumeratedAttribute {
         /**
@@ -922,7 +924,7 @@ public class ModifiedSelector extends BaseExtendSelector
          */
         @Override
         public String[] getValues() {
-            return new String[] {"hashvalue", "digest", "checksum"};
+            return new String[] {"hashvalue", "digest", "checksum", "lastmodified"};
         }
     }