diff --git a/src/main/org/apache/tools/ant/taskdefs/Jar.java b/src/main/org/apache/tools/ant/taskdefs/Jar.java
index 364cb59b4..37a30402b 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Jar.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Jar.java
@@ -98,7 +98,7 @@ public class Jar extends Zip {
 	    InputStream in = this.getClass().getResourceAsStream(s);
             if ( in == null )
 		throw new BuildException ( "Could not find: " + s );
-	    zipFile(in, zOut, "META-INF/MANIFEST.MF");
+	    zipFile(in, zOut, "META-INF/MANIFEST.MF", System.currentTimeMillis());
  	}
      }
 
diff --git a/src/main/org/apache/tools/ant/taskdefs/Zip.java b/src/main/org/apache/tools/ant/taskdefs/Zip.java
index ab0cc4b81..1af5fc920 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Zip.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Zip.java
@@ -161,10 +161,12 @@ public class Zip extends MatchingTask {
     {
     }
 
-    protected void zipFile(InputStream in, ZipOutputStream zOut, String vPath)
+    protected void zipFile(InputStream in, ZipOutputStream zOut, String vPath,
+                           long lastModified)
         throws IOException
     {
         ZipEntry ze = new ZipEntry(vPath);
+        ze.setTime(lastModified);
 
         /*
          * XXX ZipOutputStream.putEntry expects the ZipEntry to know its
@@ -222,7 +224,7 @@ public class Zip extends MatchingTask {
         throws IOException
     {
         FileInputStream fIn = new FileInputStream(file);
-        zipFile(fIn, zOut, vPath);
+        zipFile(fIn, zOut, vPath, file.lastModified());
         fIn.close();
     }
 }