Lucene的DateTools

Lucene提供的日期格式化类 DateTools默认是0时区，这样转换过去，时间应该少8小时。
要是只用时间做排序或其他过滤，这个问题可以忽略，但要是需要展示。那么就需要重写一下


private final static TimeZone GMT = TimeZone.getTimeZone("GMT ");

private static final SimpleDateFormat YEAR_FORMAT = new SimpleDateFormat("yyyy", Locale.US);
private static final SimpleDateFormat MONTH_FORMAT = new SimpleDateFormat("yyyyMM", Locale.US);
private static final SimpleDateFormat DAY_FORMAT = new SimpleDateFormat("yyyyMMdd", Locale.US);
private static final SimpleDateFormat HOUR_FORMAT = new SimpleDateFormat("yyyyMMddHH", Locale.US);
private static final SimpleDateFormat MINUTE_FORMAT = new SimpleDateFormat("yyyyMMddHHmm", Locale.US);
private static final SimpleDateFormat SECOND_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
private static final SimpleDateFormat MILLISECOND_FORMAT = new SimpleDateFormat("yyyyMMddHHmmssSSS", Locale.US);
static {
// times need to be normalized so the value doesn't depend on the
// location the index is created/used:
YEAR_FORMAT.setTimeZone(GMT);
MONTH_FORMAT.setTimeZone(GMT);
DAY_FORMAT.setTimeZone(GMT);
HOUR_FORMAT.setTimeZone(GMT);
MINUTE_FORMAT.setTimeZone(GMT);
SECOND_FORMAT.setTimeZone(GMT);
MILLISECOND_FORMAT.setTimeZone(GMT);
}