* @return the date string starting from the day of week, or null if not found
     */
    private static String getDateString(final String text) {
        for (final String dow : DAY_OF_WEEK) {
            final int i = text.lastIndexOf(dow);
            if (i != -1) {
                return text.substring(i);
            }
        }
        return null;
    }