reproducible zip entry time based on timestamp instead of now

this closes #127

src/main/java/org/codehaus/plexus/archiver/zip/AbstractZipArchiver.java

@@ -853,6 +853,7 @@ protected Date normalizeLastModifiedDate( Date lastModifiedDate )
     private static long dosToJavaTime( long dosTime )
     {
         Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis( dosTime );
         return dosTime - ( cal.get( Calendar.ZONE_OFFSET ) + cal.get( Calendar.DST_OFFSET ) );
     }
 }