code: public static Date get23HourOfDay(Date date) {
          Calendar c = Calendar.getInstance();
          c.setTime(date);
          c.set(Calendar.HOUR, 23);
          Date date23 = c.getTime();
          return date23;
      }
docs: #func 获取指定日期的23点的时间
  
  @author wangchongjie
  @version 1.0