private static DateFormat createDateFormat(String format, TimeZone timezone) {
        final SimpleDateFormat sdf = new SimpleDateFormat(format, new DateFormatSymbols(Locale.US));
        if (timezone != null) {
            sdf.setTimeZone(timezone);
        }
        return sdf;
    }
So we can return Date objects for these, this is the
list (in preference order) of the various ISO-8601
variants that we try when processing a date based
property.
tika-core/src/main/java/org/apache/tika/utils/DateUtils.java