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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);   }

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