取月末和取月初

        //取月初，判断保存的开始

        Date startStatisticsTime = new Date();

        Calendar dateFromCal = Calendar.getInstance();

        dateFromCal.setTime(startStatisticsTime);

        dateFromCal.set(Calendar.DAY_OF_MONTH, 1);

        dateFromCal.set(Calendar.HOUR_OF_DAY, 0);

        dateFromCal.set(Calendar.SECOND,0);

        dateFromCal.set(Calendar.MINUTE,0);

        Date dutyDateFrom = dateFromCal.getTime();

        //取月末

        dateFromCal.add(Calendar.MONTH, 1);

        dateFromCal.set(Calendar.DAY_OF_MONTH, 0);

        dateFromCal.set(Calendar.HOUR_OF_DAY, 23);

        dateFromCal.set(Calendar.SECOND,59);

        dateFromCal.set(Calendar.MINUTE,59);