package com.ssj.framework.basic.utils;

import org.apache.commons.lang3.time.DateFormatUtils;

import java.text.DateFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.util.*;

public class DateHelper {


    private static final long ONE_MINUTE = 60;
    private static final long ONE_HOUR = 3600;
    private static final long ONE_DAY = 86400;
    static String[] weekDays = {"日", "一", "二", "三", "四", "五", "六"};
    static Integer[] weekDay = {7, 1, 2, 3, 4, 5, 6};

    /**
     * 根据用户传入的时间表示格式，返回当前时间的格式 如果是yyyyMMdd，注意字母y不能大写。
     *
     * @param sformat yyyyMMddhhmmss
     * @return
     */
    public static String getUserDate(String sformat) {
        Date currentTime = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat(sformat);
        String dateString = formatter.format(currentTime);
        return dateString;
    }

    public static String getOrderNo(int k) {

        return getUserDate("yyyyMMddHHmmss") + getRandom(k);
    }


    /**
     * 返回一个随机数
     *
     * @param i
     * @return
     */
    public static String getRandom(int i) {
        Random jjj = new Random();
        if (i == 0){
            return "";
        }
        String jj = "";
        for (int k = 0; k < i; k++) {
            jj = jj + jjj.nextInt(9);
        }
        return jj;
    }


    public static String formatDateByFormat(Date date, String format) {
        String result = "";
        if (date != null) {
            try {
                SimpleDateFormat sdf = new SimpleDateFormat(format);
                result = sdf.format(date);
                result = "/" + result;
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    public static Date parseDate(String dateStr, String format) {
        Date date = null;
        try {
            DateFormat df = new SimpleDateFormat(format);
            String dt = dateStr;
            if ((!"".equals(dt)) && (dt.length() < format.length())) {
                dt = dt + format.substring(dt.length()).replaceAll("[YyMmDdHhSs]", "0");
            }
            date = df.parse(dt);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return date;
    }

    public static String format(String dateStr) throws Exception {

        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(dateStr);
        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
        return format.format(date.getTime());
    }


    public static String format(Date date, String format) {
        String result = "";
        try {
            if (date != null) {
                DateFormat df = new SimpleDateFormat(format);
                result = df.format(date);
            }
        } catch (Exception localException) {

        }
        return result;
    }


    public static String getDate(Date date) {
        return format(date, "yyyy/MM/dd");
    }


    public static String getDateTime(Date date) {
        return format(date, "yyyy-MM-dd HH:mm:ss");
    }


    /**
     * 获取好友的时间显示，如 5分钟前
     *
     * @param
     * @return
     */
    public static String getTimeDes(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);

        long time = date.getTime() / 1000;
        long now = System.currentTimeMillis() / 1000;
        long ago = now - time;
        if ( ONE_HOUR >=ago ) {
            return ago / ONE_MINUTE + "分钟前";
        } else if (ONE_DAY >=ago) {
            return ago / ONE_HOUR + "小时前";
        } else if ( ONE_DAY * 2 >=ago ) {
            return "昨天";
        } else if ( ONE_DAY * 3  >=ago) {
            return "前天";
        } else {
            return ago / ONE_DAY + "天前";
        }

    }

    public static String getDays(Date date, int i) throws Exception {
        int days = daysOfTwo(date, new Date());
        SimpleDateFormat format = new SimpleDateFormat("MM月dd日");
        String time = "";
        if (i == 1) {
            time = "<br/>" + format.format(date.getTime());
        }
        if (days == 0) {
            return "今天" + time;
        } else if (days == 1) {
            return "昨天" + time;
        } else if (days == 2) {
            return "前天" + time;
        } else if (days <= 7 && days >= 3) {
            return numToUpper(days - 1) + "天前" + time;
        } else if (days < 0) {
            if (days == -1) {
                return "明天" + time;
            } else if (days == -2) {
                return "后天" + time;
            }
            return Math.abs(days) + "天" + time;
        } else {
            if (days / 7 > 3) {
                return numToUpper(days / 30) + "月前" + time;
            }
            return numToUpper(days / 7) + "周前" + time;
        }

    }

    public static String numToUpper(int num) {
        String[] u = {"上", "两", "三", "四", "五", "六", "七", "八", "九"};
        char[] str = String.valueOf(num).toCharArray();
        String rstr = "";
        for (int i = 0; i < str.length; i++) {
            rstr = rstr + u[Integer.parseInt(str[i] + "")];
        }
        return rstr;
    }




    /**
     * 将时间转换为标准的天+小时+分+秒格式
     */
    public static  String getStandardTime(long diff){
        String DateTimes = null;
        long hours = (diff % ( 60 * 60 * 24)) / (60 * 60);
        long minutes = (diff % ( 60 * 60)) /60;
        long seconds = diff % 60;
        if(hours>0){
            DateTimes=hours + ":" + minutes + ":"    + seconds;
        }else if(minutes>0){
            DateTimes="00"+":"+minutes + ":"    + seconds;
        }else{
            DateTimes="00"+":"+"00"+":"+seconds;
        }  return DateTimes;


    }


    public static String getDifferenceTime(Date one, Date two) {
        String DateTimes = null;
        long day = 0;
        long hour = 0;
        long min = 0;
        long sec = 0;
        long time1 = one.getTime();
        long time2 = two.getTime();
        long diff;
        if (time1 < time2) {
            diff = (time2 - time1);
        } else {
            diff = (time1 - time2);
        }
        long days = diff / (1000 * 60 * 60 * 24);
        long hours = (diff-days*(1000 * 60 * 60 * 24))/(1000* 60 * 60);
        long minutes = (diff-days*(1000 * 60 * 60 * 24)-hours*(1000* 60 * 60))/(1000* 60);
        long seconds=(diff/1000-days*24*60*60-hours*60*60-minutes*60);//获取秒
        long addHour=hours+days*24;
        if(addHour>0){
            DateTimes=addHour + ":" + minutes + ":"    + seconds;
        }else if(minutes>0){
            DateTimes="00"+":"+minutes + ":"    + seconds;
        }else{
            DateTimes="00"+":"+"00"+":"+seconds;
        }  return DateTimes;
    }

    public static String getCostTime(Date one, Date two) {
        long time1 = one.getTime();
        long time2 = two.getTime();
        long diff;
        if (time1 < time2) {
            diff = time2 - time1;
        } else {
            diff = time1 - time2;
        }
        long min = diff / (60 * 1000);
        return Long.toString(min);
    }

    public static Date getNextDay(Date date, int days) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DAY_OF_MONTH, days);
        date = calendar.getTime();
        return date;
    }

    /**
     * 获取上月的第一天
     *
     * @param date
     * @param
     * @return 创建人：ZhangCaibao
     * 2018年2月1日 上午9:55:52
     * @Date
     */
    public static Date getLastMonthFirstDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, -1);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        date = calendar.getTime();
        return date;
    }

    /**
     * 获取下月的第一天
     *
     * @param date
     * @param
     * @return 创建人：ZhangCaibao
     * 2018年2月1日 上午9:55:52
     * @Date
     */
    public static Date getNextMonthFirstDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, 1);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        date = calendar.getTime();
        return date;
    }

    public static Date getTheMonthFirstDay() {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        return calendar.getTime();
    }

    /**
     * 获取上月的最后一天
     *
     * @param date
     * @param
     * @return 创建人：ZhangCaibao
     * 2018年2月1日 上午9:55:52
     * @Date
     */
    public static Date getLastMonthLastDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.DAY_OF_MONTH, 0);
        date = calendar.getTime();
        return date;
    }

    public static int getMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int month = calendar.get(Calendar.MONTH) + 1;
        return month;
    }





    /**
     * @param
     * @return 根据开学时间，和当前时间，相差几周。
     * @throws Exception
     * @Integer
     */
    public static Integer diffWeeks(String date) throws Exception {
        Date startDate = parseDate(date, "yyyy-MM-dd");
        Date endDate = new SimpleDateFormat("yyyy-MM-dd").parse(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
        Long weekNum = ((endDate.getTime() / 1000 - startDate.getTime() / 1000) % 604800) > 0 ? (endDate.getTime() / 1000 - startDate.getTime() / 1000) / 604800 + 1 : (endDate.getTime() / 1000 - startDate.getTime() / 1000) / 604800;
        return weekNum.intValue();
    }

    public static Integer diffWeeks(String date, Date start) throws Exception {
        Date startDate = parseDate(date, "yyyy-MM-dd");
        Date endDate = new SimpleDateFormat("yyyy-MM-dd").parse(new SimpleDateFormat("yyyy-MM-dd").format(start));
        Long weekNum = ((endDate.getTime() / 1000 - startDate.getTime() / 1000) % 604800) > 0 ? (endDate.getTime() / 1000 - startDate.getTime() / 1000) / 604800 + 1 : (endDate.getTime() / 1000 - startDate.getTime() / 1000) / 604800;
        return weekNum.intValue();
    }

    /**
     * 判断当前时间是不是大于活动结束时间
     *
     * @param
     * @param date
     * @return
     * @throws Exception
     */
    public static boolean isInDate(Date date, String strDateBegin,
                                   String strDateEnd) {
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date beginDate = sdf.parse(strDateBegin);
            Date endDate = sdf.parse(strDateEnd);
            if (date.getTime() >= beginDate.getTime() && date.getTime() <= endDate.getTime()) {
                return true;
            }

        } catch (Exception e) {
            return false;
        }
        return false;
    }

    public static boolean isInDate(Date date, Date beginDate,
                                   Date endDate) {
        try {
            if (date.getTime() >= beginDate.getTime() && date.getTime() <= endDate.getTime()) {
                return true;
            }

        } catch (Exception e) {
            return false;
        }
        return false;
    }


    /**
     * 根据日期字符串判断周几
     *
     * @param
     * @return
     * @throws Exception
     */
    public static int getday(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        //第几天，从周日开始
        int day = calendar.get(Calendar.DAY_OF_WEEK);
        return day;
    }

    public static String getWeekDays(Date date) {
        int day = getday(date);
        return weekDays[day - 1];
    }

    public static Integer getWeekDay(Date date) {
        int day = getday(date);
        return weekDay[day - 1];
    }


    /**
     * @param date         当前时间
     * @param week_of_year 第几周 下周（1），下下周（2）
     * @param day_of_week  周几，周日（1），周一（2），周六（7）
     * @return
     */
    public static Date getNextTuesday(Date date, int week_of_year, int day_of_week) {
        Calendar cal = Calendar.getInstance();

        cal.setTime(date);
        cal.add(Calendar.WEEK_OF_YEAR, week_of_year);
        cal.set(Calendar.DAY_OF_WEEK, day_of_week);

        return cal.getTime();
    }

    public static String getPercentage(int num1, int num2) {
        // 创建一个数值格式化对象

        NumberFormat numberFormat = NumberFormat.getInstance();

        // 设置精确到小数点后2位  

        numberFormat.setMaximumFractionDigits(2);

        String result = numberFormat.format((float) num1 / (float) num2 * 100);
        return result + "%";
    }

    /**
     * 比较两个日期相差的天数
     *
     * @param
     * @param
     * @return
     * @throws Exception
     */
    public static int daysOfTwo(Date smdate, Date bdate) throws Exception {

        smdate = new SimpleDateFormat("yyyy-MM-dd").parse(new SimpleDateFormat("yyyy-MM-dd").format(smdate));
        bdate = new SimpleDateFormat("yyyy-MM-dd").parse(new SimpleDateFormat("yyyy-MM-dd").format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return daysOfTian(smdate,bdate);

    }
    public static LocalDate date2LocalDate(Date date) {
        Instant instant = date.toInstant();
        ZoneId zoneId = ZoneId.systemDefault();
        LocalDate localDate = instant.atZone(zoneId).toLocalDate();
        return localDate;
    }

    public static int daysOfTian(Date date1, Date date2) {

        if (date1 == null || date2 == null) {
            throw new RuntimeException("日期不能为空");
        }
        LocalDate localDate1 = date2LocalDate(date1);
        LocalDate localDate2 = date2LocalDate(date2);

        return  (int) (localDate2.toEpochDay() - localDate1.toEpochDay());
    }

    /**
     * 获取相差的天数
     *
     * @param
     * @param
     * @return
     * @throws Exception 创建人：ZhangCaibao
     *                   2017年4月19日 下午4:27:42
     * @int
     */
    public static int daysDiffer(String startdate, String enddate) throws Exception {

        Date smdate = new SimpleDateFormat("yyyy-MM-dd").parse(startdate);
        Date bdate = new SimpleDateFormat("yyyy-MM-dd").parse(enddate);
        return  daysOfTian(smdate,bdate);

    }

    public static String dateFormatString(String dateStr, int days) throws Exception {
        Date smdate = new SimpleDateFormat("yyyy-MM-dd").parse(dateStr);
        if (days > 90) {
            return format(smdate, "MM月dd日");
        } else {
            return format(smdate, "YYYY年MM月dd日");
        }

    }

    /**
     * 根据时间来拼接
     *
     * @param
     * @param hhmmss
     * @return
     */
    public static Date timeStitching(Date date, String hhmmss) throws Exception {
        String yyyyMMdd = new SimpleDateFormat("yyyy-MM-dd").format(date);
        Date datefor = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(yyyyMMdd + " " + hhmmss);
        return datefor;
    }




    //判断选择的日期是否是本月
    public static boolean isThisMonth(Date date) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        String param = sdf.format(date);//参数时间
        String now = sdf.format(new Date());//当前时间
        if (param.equals(now)) {
            return true;
        }
        return false;
    }

    public static Date getMonthDate(Date smdate, int month) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + month);
        return cal.getTime();
    }

    public static Date getYearDate(Date smdate, int year) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + year);
        return cal.getTime();
    }



    public static Map<String, Object> getDifferenceTimeHourMap(Date one, Date two) {
        Map<String, Object> map = new HashMap<String, Object>();
        long day = 0;
        long hour = 0;
        long min = 0;
        long sec = 0;
        long time1 = one.getTime();
        long time2 = two.getTime();
        long diff;
        if (time1 < time2) {
            diff = time2 - time1;
        } else {
            diff = time1 - time2;
        }
        day = diff / (24 * 60 * 60 * 1000);
        hour = (diff / (60 * 60 * 1000) - day * 24);
        min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);
        sec = (diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
        map.put("day", day < 10 ? "0" + day : day);
        map.put("hour", hour < 10 ? "0" + hour : hour);
        map.put("min", min < 10 ? "0" + min : min);
        map.put("sec", sec < 10 ? "0" + sec : sec);
        map.put("millisecond", diff);
        return map;
    }

    //两时间差
    public static long getDifferenceTimeNum(Date one, Date two) {
        long time1 = one.getTime();
        long time2 = two.getTime();
        long diff;
        if (time1 < time2) {
            diff = time2 - time1;
        } else {
            diff = time1 - time2;
        }
        return diff;

    }



    public static boolean isSameDate(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        boolean isSameYear = cal1.get(Calendar.YEAR) == cal2
                .get(Calendar.YEAR);
        boolean isSameMonth = isSameYear
                && cal1.get(Calendar.MONTH) == cal2.get(Calendar.MONTH);
        boolean isSameDate = isSameMonth
                && cal1.get(Calendar.DAY_OF_MONTH) == cal2
                .get(Calendar.DAY_OF_MONTH);
        return isSameDate;
    }

    /**
     * @param sformat   时间格式
     * @param beforeDay 如果为负数即当前时间前beforeDay天，如果为正数则为当前时间后beforeDay天
     * @return 方法说明:
     * <p>
     * 创立日期:2018年5月16日 下午3:51:09
     * 创建人:yangcan
     */
    public static String getBeforeDate(String sformat, int beforeDay) {
        Calendar calendar = Calendar.getInstance(); //得到日历
        calendar.setTime(new Date());//把当前时间赋给日历
        calendar.add(Calendar.DAY_OF_MONTH, beforeDay);  //设置为当前时间前beforeDay天
        SimpleDateFormat formatter = new SimpleDateFormat(sformat);
        String dateString = formatter.format(calendar.getTime());
        return dateString;
    }


    /**
     * @param date   传入时间
     * @param hour   传入时间加小时
     * @param minute 传入时间加分钟
     * @return 方法说明:返回传入时间加小时，分钟后的时间
     * <p>
     * 创立日期:2018年6月10日 下午3:19:32
     * 创建人:yangcan
     */
    public static Date getAddHour(Date date, int hour, int minute) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.HOUR, hour);
        cal.add(Calendar.MINUTE, minute);
        return cal.getTime();
    }

    public static List<Map<String, Object>> nearWeek() {
        List<Map<String, Object>> mlist = new ArrayList<Map<String, Object>>();
        String[] weekDays = {"周日", "周一", "周二", "周三", "周四", "周五", "周六"};
        for (int i = -6; i <= 0; i++) {
            Map<String, Object> map = new HashMap<>();
            Calendar cal = Calendar.getInstance();
            cal.add(5, i);
            int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
            if (w < 0){
                w = 0;
            }
            if (i == 0) {
                map.put("dateTime", "今");
            } else {
                map.put("dateTime", new SimpleDateFormat("dd").format(cal.getTime()));
            }
            map.put("time", new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime()));
            map.put("dateWeek", weekDays[w]);
            mlist.add(map);
        }
        return mlist;
    }

    public static int diffDate(java.util.Date endDate, java.util.Date startDate) {
        return (int) ((getMillis(endDate) - getMillis(startDate)) / 86400000L);
    }

    public static long getMillis(java.util.Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.getTimeInMillis();
    }

    /**
     * 计算两个日期之间相差的天数
     *
     * @param smdate 较小的时间
     * @param bdate  较大的时间
     * @return 相差天数
     * @throws ParseException
     */
    public static int daysBetween(Date smdate, Date bdate) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        smdate = sdf.parse(sdf.format(smdate));
        bdate = sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }

    /**
     * 计算两段日期重叠的天数
     *
     * 这里共有2个时间段（b1-----e1）【b2-----e2】，4个时间点；
     * 相当于两条线段(b代表起点，e代表端点，b<=e)，4个端点。
     * 可分3种情况：
     * 1.不相交。（b1-----e1）【b2-----e2】（b1-----e1）。if(e1<b2||b1>e2)此时，重合天数为零。
     * 2.相交。
     * 情况一：（b1---【b2---e1）----e2】          if(b1<b2&&e1<e2&&e1>b2)
     * 情况二：【b2---(b1---e2】----e1)	   if(b1>b2&&b1<e2&&e2<e1)
     * 3.包含：计算较短的时间段日期长度。
     * （b1---【b2-----e2】--e1）			   if(b1<b2&&e1>e2)
     * 【b2---（b1-----e1）--e2】			   if(b1>b2&&e1<e2)
     *
     * @param begindate1     开始日期
     * @param enddate1       结束日期
     * @param begindate2     开始日期
     * @param enddate2       结束日期
     * @return
     */
    public static Integer getDayCoincidence(Date begindate1, Date enddate1, Date begindate2, Date enddate2) throws ParseException {
        //转换为天判断
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        begindate1 = sdf.parse(sdf.format(begindate1));
        enddate1 = sdf.parse(sdf.format(enddate1));
        begindate2 = sdf.parse(sdf.format(begindate2));
        enddate2 = sdf.parse(sdf.format(enddate2));
        long b1 = begindate1.getTime();
        long e1 = enddate1.getTime();
        long b2 = begindate2.getTime();
        long e2 = enddate2.getTime();
        assert (b1 < e1 && b2 < e2);
        Integer coincidenceDay;
        if (b1 <= b2 && e1 >= e2) {
            System.out.println("1包含2：（b1---【b2-----e2】--e1）");
            coincidenceDay = daysBetween(begindate2, enddate2) + 1;
        } else if (b1 >= b2 && e1 <= e2) {
            System.out.println("2包含1：【b2---（b1-----e1）--e2】");
            coincidenceDay = daysBetween(begindate1, enddate1) + 1;
        } else if (b1 >= b2 && b1 <= e2 && e2 <= e1) {
            System.out.println("相交：【b2---(b1---e2】----e1)");
            coincidenceDay = daysBetween(begindate1, enddate2) + 1;
        } else if (b1 <= b2 && e1 <= e2 && e1 >= b2) {
            System.out.println("相交：（b1---【b2---e1）----e2】");
            coincidenceDay = daysBetween(begindate2, enddate1) + 1;
        } else if (e1 < b2 || b1 > e2) {
            coincidenceDay = 0;
        } else {
            System.out.println("意料外的日期组合，无法计算重合天数！");
            coincidenceDay = null;
        }
        //取绝对值
        return coincidenceDay != null ? Math.abs(coincidenceDay) : null;
    }

    /**
     * 比较两个日期大小（只精确到日）
     *
     * @param smallDate 小日期
     * @param bigDate 大日期
     * @return
     */
    public static boolean compareTwoDate(Date smallDate, Date bigDate) {
        String smallString = DateFormatUtils.format(smallDate, "yyyy-MM-dd");
        String bigString = DateFormatUtils.format(bigDate, "yyyy-MM-dd");
        if (smallString.compareTo(bigString) <= 0) {
            return true;
        }
        return false;
    }


    /**
     * 获取当前日期是星期几
     *
     * @param date
     * @param style
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date date, int style) {
        String[] weekZhouDays = {"周天", "周一", "周二", "周三", "周四", "周五", "周六"};
        String[] weekXingqiDays = {"星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0) {
            w = 0;
        }
        if (1 == style) {
            return weekZhouDays[w];
        } else {
            return weekXingqiDays[w];
        }
    }

    /**
     * 给定月份，得到当月最后一天的零点
     */
    public static  String getLastTime(String date) throws Exception{
        Calendar cal=Calendar.getInstance();
        cal.setTime(new SimpleDateFormat("yyyy-MM").parse(date));
        int lastDay=cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        cal.set(Calendar.DAY_OF_MONTH,lastDay);
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        String time=sdf.format(cal.getTime())+" 24:00:00";
        return time;

    }

    /**
     * 给定月份，得到当月第一天一天的零点
     */
    public static  String getBeginTime(String date) throws Exception{
        Calendar cal=Calendar.getInstance();
        cal.setTime(new SimpleDateFormat("yyyy-MM").parse(date));
        cal.set(Calendar.DAY_OF_MONTH,1);
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        String time=sdf.format(cal.getTime())+" 00:00:00";
        return time;

    }

  

    
    
    //得到日历列表，包含周几
    public static List<String[]> nextCalendarList() {
        List<String[]> calendarList=new ArrayList<String[]>();
	    Date d = nextMonthFirstDate(); 
        Date date = getMonthStart(d);
        Date monthEnd = getMonthEnd(d);
        while (!date.after(monthEnd)) {
           String[] dataStrs={DateHelper.format(date, "yyyy-MM-dd"),dateToWeek(date)};
           calendarList.add(dataStrs);
           date = getNext(date);
        }
    	return calendarList;
    }
    

    
   //取得上个月的1号
    public static Date theMonthFirstDate(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.MONTH, -1);
        return calendar.getTime();
    }
    
    
    //取得下个月的1号
    public static Date nextMonthFirstDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.MONTH, 1);
        return calendar.getTime();
    }
 
    //当月的开始日期
    public static Date getMonthStart(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int index = calendar.get(Calendar.DAY_OF_MONTH);
        calendar.add(Calendar.DATE, (1 - index));
        return calendar.getTime();
    }
    //当月的结束日期
    private static Date getMonthEnd(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, 1);
        int index = calendar.get(Calendar.DAY_OF_MONTH);
        calendar.add(Calendar.DATE, (-index));
        return calendar.getTime();
    }
    //下一个日期
    private static Date getNext(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, 1);
        return calendar.getTime();
    }
 
    //周几
    public static String dateToWeek(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        return String.valueOf(weekDay[w]) ;
    }
    
    //时间戳转换为标准日期

    public  static  String getStandTime(Date date){
        SimpleDateFormat format =  new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return format.format(date);
    }
    
	
	 public static boolean dateQualsByMonth(Date dateOne, Date dateTwo) {
       Calendar calendarOne = Calendar.getInstance();
       calendarOne.setTime(dateOne);
       Calendar calendarTwo = Calendar.getInstance();
       calendarTwo.setTime(dateTwo);
       return calendarOne.get(Calendar.YEAR) == calendarTwo.get(Calendar.YEAR) && calendarOne.get(Calendar.MONTH) == calendarTwo.get(Calendar.MONTH);
	  } 
	 
	 public static boolean isLastDayOfMonth(Date curMonthDate,Date date) {
	    Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		
		Calendar maxCalendar = Calendar.getInstance();
		maxCalendar.setTime(curMonthDate);
		return calendar.get(Calendar.DAY_OF_MONTH) == maxCalendar
				.getActualMaximum(Calendar.DAY_OF_MONTH);
	 }
	 

	 public static int getDifferMonth(Date start, Date end) {
	      if(end.getTime()<=start.getTime()) {
	    	  return 0;
	      }
	      int i=1;
	      while (true) {
	    	  Calendar startCalendar = Calendar.getInstance();
	    	  startCalendar.setTime(start);
	    	  startCalendar.add(Calendar.MONTH, i);
	    	  if(startCalendar.getTime().getTime()>=end.getTime()) {
	    		  break;
	    	  }
	    	  i=i+1;
	      }
	      return i;
	  }
	 
	 
	 public static void main(String[] args) throws ParseException {
		
		 DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		 System.out.println(getDifferMonth(format.parse("2020-12-01"), format.parse("2020-05-15")));
		 
	}
	 

}