code: @Override
      public boolean isTimeIncluded(long timeStamp) {
          Date lookFor = getStartOfDayJavaCalendar(timeStamp).getTime();
          boolean include=workdays.contains(lookFor);
          return include;
      }
docs: 对于工作日的判断与节假日正好相反，只需要简单判断当前给定日期是否是工作日即可，如果是工作日，那么就直接返回true，否则返回false