Hi Please help review the changeset for JDK-8206389 issue: https://bugs.openjdk.java.net/browse/JDK-8206389 webrev: http://cr.openjdk.java.net/~sherman/8206389/webrev Cause: ZipOutputStream.writeCEN().writeCEN() incorrectly calculate the length of bytes needed for the "unix timestamps" when the "last modified time" is NOT set. The info-zip spec specifies that The central-header extra field contains the modification time only, or no timestamp at all. TSize is used to flag its presence or absence. But note: So in this case, when "creation time", "last access time" are set but the "last modified time" is not. only the "tag", "size" and "flag" should be output to the extra field, no real "mtime" timestamp, so the total size of the bytes needed is 5, not 9. Thanks, Sherman