diff --git a/src/main/org/apache/tools/ant/taskdefs/Zip.java b/src/main/org/apache/tools/ant/taskdefs/Zip.java
index 5d68b2f97..00ba91289 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Zip.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Zip.java
@@ -25,6 +25,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -55,6 +56,7 @@ import org.apache.tools.ant.types.resources.FileResource;
 import org.apache.tools.ant.types.resources.Union;
 import org.apache.tools.ant.types.resources.ZipResource;
 import org.apache.tools.ant.types.resources.selectors.ResourceSelector;
+import org.apache.tools.ant.util.DateUtils;
 import org.apache.tools.ant.util.FileNameMapper;
 import org.apache.tools.ant.util.FileUtils;
 import org.apache.tools.ant.util.GlobPatternMapper;
@@ -122,6 +124,9 @@ public class Zip extends MatchingTask {
                 }
             };
 
+    private String fixedModTime = null; // User-provided.
+    protected long modTimeMillis = 0; // Calculated.
+
     /**
      * If this flag is true, execute() will run most operations twice,
      * the first time with {@link #skipWriting skipWriting} set to
@@ -584,6 +589,27 @@ public class Zip extends MatchingTask {
         return zip64Mode;
     }
 
+    /**
+     * Set all stored file modification times to {@code time}.
+     * @param time Milliseconds since 1970-01-01 00:00, or
+     *        <code>YYYY-MM-DD{T/ }HH:MM[:SS[.SSS]][ ][±ZZ[[:]ZZ]]</code>, or
+     *        <code>MM/DD/YYYY HH:MM[:SS] {AM/PM}</code>, where {a/b} indicates
+     *        that you must choose one of a or b, and [c] indicates that you
+     *        may use or omit c. ±ZZZZ is the timezone offset, and may be
+     *        literally "Z" to mean GMT.
+     */
+    public void setModificationtime(String time) {
+        fixedModTime = time;
+    }
+
+    /**
+     * The file modification time previously provided to
+     * {@link #setModificationtime(String)} or {@code null} if unset.
+     */
+    public String getModificationtime() {
+        return fixedModTime;
+    }
+
     /**
      * validate and build
      * @throws BuildException on error
@@ -836,6 +862,17 @@ public class Zip extends MatchingTask {
                                      + archiveType + " file to create!");
         }
 
+        if (fixedModTime != null) {
+            try {
+                modTimeMillis = DateUtils.parseLenientDateTime(fixedModTime).getTime();
+            } catch (ParseException pe) {
+                throw new BuildException("Failed to parse date string " + fixedModTime + ".");
+            }
+            if (roundUp) {
+                modTimeMillis += ROUNDUP_MILLIS;
+            }
+        }
+
         if (zipFile.exists() && !zipFile.isFile()) {
             throw new BuildException(zipFile + " is not a file.");
         }
@@ -1716,7 +1753,9 @@ public class Zip extends MatchingTask {
             // ZIPs store time with a granularity of 2 seconds, round up
             final int millisToAdd = roundUp ? ROUNDUP_MILLIS : 0;
 
-            if (dir != null && dir.isExists()) {
+            if (fixedModTime != null) {
+                ze.setTime(modTimeMillis);
+            } else if (dir != null && dir.isExists()) {
                 ze.setTime(dir.getLastModified() + millisToAdd);
             } else {
                 ze.setTime(System.currentTimeMillis() + millisToAdd);
@@ -1803,7 +1842,7 @@ public class Zip extends MatchingTask {
 
         if (!skipWriting) {
             final ZipEntry ze = new ZipEntry(vPath);
-            ze.setTime(lastModified);
+            ze.setTime(fixedModTime != null ? modTimeMillis : lastModified);
             ze.setMethod(doCompress ? ZipEntry.DEFLATED : ZipEntry.STORED);
 
             /*
diff --git a/src/main/org/apache/tools/ant/util/DateUtils.java b/src/main/org/apache/tools/ant/util/DateUtils.java
index 9ce737b0a..37874eed4 100644
--- a/src/main/org/apache/tools/ant/util/DateUtils.java
+++ b/src/main/org/apache/tools/ant/util/DateUtils.java
@@ -26,6 +26,10 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.tools.ant.taskdefs.Touch;
 
 /**
  * Helper methods to deal with date/time formatting with a specific
@@ -298,4 +302,50 @@ public final class DateUtils {
             return parseIso8601Date(datestr);
         }
     }
+
+    final private static ThreadLocal<DateFormat> iso8601WithTimeZone =
+        new ThreadLocal<DateFormat>() {
+            @Override protected DateFormat initialValue() {
+              // An arbitrary easy-to-read format to normalize to.
+              return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS Z");
+            }
+        };
+    final private static Pattern iso8601normalizer = Pattern.compile(
+        "^(\\d{4,}-\\d{2}-\\d{2})[Tt ]" +           // yyyy-MM-dd
+        "(\\d{2}:\\d{2}(:\\d{2}(\\.\\d{3})?)?) ?" + // HH:mm:ss.SSS
+        "(?:Z|([+-]\\d{2})(?::?(\\d{2}))?)?$");     // Z
+
+    /**
+     * Parse a lenient ISO 8601, ms since epoch, or {@code <touch>}-style date.
+     * That is:
+     * <ul>
+     * <li>Milliseconds since 1970-01-01 00:00</li>
+     * <li><code>YYYY-MM-DD{T| }HH:MM[:SS[.SSS]][ ][±ZZ[[:]ZZ]]</code></li>
+     * <li><code>MM/DD/YYYY HH:MM[:SS] {AM|PM}</code></li></ul>
+     * where {a|b} indicates that you must choose one of a or b, and [c]
+     * indicates that you may use or omit c. ±ZZZZ is the timezone offset, and
+     * may be literally "Z" to mean GMT.
+     */
+    public static Date parseLenientDateTime(String dateStr) throws ParseException {
+        try {
+            return new Date(Long.parseLong(dateStr));
+        } catch (NumberFormatException nfe) {}
+
+        try {
+            return Touch.DEFAULT_DF_FACTORY.getPrimaryFormat().parse(dateStr);
+        } catch (ParseException pe) {}
+
+        try {
+           return Touch.DEFAULT_DF_FACTORY.getFallbackFormat().parse(dateStr);
+        } catch (ParseException pe) {}
+
+        Matcher m = iso8601normalizer.matcher(dateStr);
+        if (!m.find()) throw new ParseException(dateStr, 0);
+        String normISO = m.group(1) + " "
+            + (m.group(3) == null ? m.group(2) + ":00" : m.group(2))
+            + (m.group(4) == null ? ".000 " : " ")
+            + (m.group(5) == null ? "+00" : m.group(5))
+            + (m.group(6) == null ? "00" : m.group(6));
+        return iso8601WithTimeZone.get().parse(normISO);
+    }
 }