月份，推出本月第一天日期，和最后一天日期

Map
 
   params = new HashMap<>();
	Calendar calendar = Calendar.getInstance();
	calendar.setTime(new SimpleDateFormat("yyyyMM").parse(attendanceRequisition.getMonth() + ""));
	calendar.set(Calendar.DAY_OF_MONTH, 1);
	Date beginDate = DateUtil.trunkToDayStart(calendar.getTime());
	calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
	Date endDate = DateUtil.trunkToDayEnd(calendar.getTime());
	attendanceRequisition.setBeginDate(beginDate);
	attendanceRequisition.setEndDate(endDate);