月开始时间/月结束时间

        SimpleDateFormat datetime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        SimpleDateFormat date = new SimpleDateFormat("yyyy-MM-dd");        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.DAY_OF_MONTH, 1);        Date startDate = datetime.parse(date.format(calendar.getTime()) + " 00:00:00");        calendar.add(Calendar.MONTH, 1);        calendar.add(Calendar.DAY_OF_MONTH, -1);        Date endDate = datetime.parse(date.format(calendar.getTime()) + " 23:59:59");