diff --git a/src/main/org/apache/tools/ant/taskdefs/Zip.java b/src/main/org/apache/tools/ant/taskdefs/Zip.java
index 70436fb15..b4c1c57e0 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Zip.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Zip.java
@@ -62,12 +62,13 @@ import java.io.OutputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.ByteArrayInputStream;
 
+import java.util.Calendar;
 import java.util.Hashtable;
 import java.util.Stack;
-
 import java.util.Vector;
 import java.util.zip.CRC32;
 import java.util.zip.ZipInputStream;
+
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.FileScanner;
 import org.apache.tools.ant.Project;
@@ -76,6 +77,7 @@ import org.apache.tools.ant.types.FileSet;
 import org.apache.tools.ant.types.EnumeratedAttribute;
 import org.apache.tools.ant.types.ZipFileSet;
 import org.apache.tools.ant.types.ZipScanner;
+import org.apache.tools.ant.util.DateUtils;
 import org.apache.tools.ant.util.FileUtils;
 import org.apache.tools.ant.util.SourceFileScanner;
 import org.apache.tools.ant.util.MergingMapper;
@@ -135,9 +137,21 @@ public class Zip extends MatchingTask {
      * @deprecated Use setDestFile(File) instead
      */
     public void setFile(File file) {
-        log("DEPRECATED - The file attribute has been renamed destfile."
-            +" This attribute will be unsupported before Ant1.5 is released",
+        log("DEPRECATED - The file attribute has been renamed destfile.",
             Project.MSG_ERR);
+        log("This attribute will be unsupported before Ant1.5 is released.",
+            Project.MSG_ERR);
+
+        log("Be aware that the effect of using the file attribute depends on",
+            Project.MSG_ERR);
+        log("the phase of the moon.", Project.MSG_WARN);
+        int phase = DateUtils.getPhaseOfMoon(Calendar.getInstance());
+        if (phase == 4) {
+            log("You are lucky!  Full moon tonight.");
+        } else if (phase == 0) {
+            log("Be careful!  New moon tonight.", Project.MSG_WARN);
+        }
+        
         setDestFile(file);
     }
 
diff --git a/src/main/org/apache/tools/ant/util/DateUtils.java b/src/main/org/apache/tools/ant/util/DateUtils.java
index 06eeef26b..45a7fcf10 100644
--- a/src/main/org/apache/tools/ant/util/DateUtils.java
+++ b/src/main/org/apache/tools/ant/util/DateUtils.java
@@ -57,6 +57,7 @@ import java.text.ChoiceFormat;
 import java.text.DateFormat;
 import java.text.MessageFormat;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.TimeZone;
 
@@ -66,6 +67,11 @@ import java.util.TimeZone;
  * or a plurialization correct elapsed time in minutes and seconds.
  *
  * @author <a href="mailto:sbailliez@apache.org">Stephane Bailliez</a>
+ * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
+ *
+ * @since Ant 1.5
+ * 
+ * @version $Revision$
  */
 public final class DateUtils {
 
@@ -172,4 +178,45 @@ public final class DateUtils {
         return sdf;
     }
 
+    /**
+     * Calculate the phase of the moon for a given date.
+     *
+     * <p>Code heavily influenced by hacklib.c in <a
+     * href="http://www.nethack.org/">Nethack</a></p>
+     *
+     * <p>The Algorithm:
+     *
+     * <pre>
+     * moon period = 29.53058 days ~= 30, year = 365.2422 days
+     *
+     * days moon phase advances on first day of year compared to preceding year
+     *	= 365.2422 - 12*29.53058 ~= 11
+     *
+     * years in Metonic cycle (time until same phases fall on the same days of
+     *	the month) = 18.6 ~= 19
+     *
+     * moon phase on first day of year (epact) ~= (11*(year%19) + 18) % 30
+     *	(18 as initial condition for 1900)
+     *
+     * current phase in days = first day phase + days elapsed in year
+     *
+     * 6 moons ~= 177 days
+     * 177 ~= 8 reported phases * 22
+     * + 11/22 for rounding
+     * </pre>
+     *
+     * @return The phase of the moon as a number between 0 and 7 with
+     *         0 meaning new moon and 4 meaning full moon.
+     *
+     * @since 1.2, Ant 1.5
+     */
+    public static int getPhaseOfMoon(Calendar cal) {
+        int dayOfTheYear = cal.get(Calendar.DAY_OF_YEAR);
+        int yearInMetonicCycle = ((cal.get(Calendar.YEAR)-1900) % 19) + 1;
+	int epact = (11 * yearInMetonicCycle + 18) % 30;
+	if ((epact == 25 && yearInMetonicCycle > 11) || epact == 24) {
+            epact++;
+        }
+	return (((((dayOfTheYear + epact) * 6) + 11) % 177) / 22) & 7;
+    }
 }
diff --git a/src/testcases/org/apache/tools/ant/util/DateUtilsTest.java b/src/testcases/org/apache/tools/ant/util/DateUtilsTest.java
index f516fe6c3..da17e5dc4 100644
--- a/src/testcases/org/apache/tools/ant/util/DateUtilsTest.java
+++ b/src/testcases/org/apache/tools/ant/util/DateUtilsTest.java
@@ -63,6 +63,7 @@ import junit.framework.TestCase;
  * TestCase for DateUtils.
  *
  * @author <a href="mailto:sbailliez@apache.org">Stephane Bailliez</a>
+ * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
  */
 public class DateUtilsTest extends TestCase {
     public DateUtilsTest(String s) {
@@ -115,4 +116,15 @@ public class DateUtilsTest extends TestCase {
                 DateUtils.ISO8601_TIME_PATTERN);
         assertEquals("20:11:12", text);
     }
+
+    public void testPhaseOfMoon() {
+        TimeZone timeZone = TimeZone.getTimeZone("GMT");
+        Calendar cal = Calendar.getInstance(timeZone);
+        // should be full moon
+        cal.set(2002, 2, 27);
+        assertEquals(4, DateUtils.getPhaseOfMoon(cal));
+        // should be new moon
+        cal.set(2002, 2, 12);
+        assertEquals(0, DateUtils.getPhaseOfMoon(cal));
+    }
 }