import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalUnit;
import java.util.*;

/**
 * Java8時(shí)間方法LocalDate和LocalDateTime
 * getYear()    int    獲取當(dāng)前日期的年份
 * getMonth()    Month    獲取當(dāng)前日期的月份對(duì)象
 * getMonthValue()    int    獲取當(dāng)前日期是第幾月
 * getDayOfWeek()    DayOfWeek    表示該對(duì)象表示的日期是星期幾
 * getDayOfMonth()    int    表示該對(duì)象表示的日期是這個(gè)月第幾天
 * getDayOfYear()    int    表示該對(duì)象表示的日期是今年第幾天
 * withYear(int year)    LocalDate    修改當(dāng)前對(duì)象的年份
 * withMonth(int month)    LocalDate    修改當(dāng)前對(duì)象的月份
 * withDayOfMonth(int dayOfMonth)    LocalDate    修改當(dāng)前對(duì)象在當(dāng)月的日期
 * isLeapYear()    boolean    是否是閏年
 * lengthOfMonth()    int    這個(gè)月有多少天
 * lengthOfYear()    int    該對(duì)象表示的年份有多少天（365或者366）
 * plusYears(long yearsToAdd)    LocalDate    當(dāng)前對(duì)象增加指定的年份數(shù)
 * plusMonths(long monthsToAdd)    LocalDate    當(dāng)前對(duì)象增加指定的月份數(shù)
 * plusWeeks(long weeksToAdd)    LocalDate    當(dāng)前對(duì)象增加指定的周數(shù)
 * plusDays(long daysToAdd)    LocalDate    當(dāng)前對(duì)象增加指定的天數(shù)
 * minusYears(long yearsToSubtract)    LocalDate    當(dāng)前對(duì)象減去指定的年數(shù)
 * minusMonths(long monthsToSubtract)    LocalDate    當(dāng)前對(duì)象減去注定的月數(shù)
 * minusWeeks(long weeksToSubtract)    LocalDate    當(dāng)前對(duì)象減去指定的周數(shù)
 * minusDays(long daysToSubtract)    LocalDate    當(dāng)前對(duì)象減去指定的天數(shù)
 * compareTo(ChronoLocalDate other)    int    比較當(dāng)前對(duì)象和other對(duì)象在時(shí)間上的大小作媚，返回值如果為正纸泡，則當(dāng)前對(duì)象時(shí)間較晚弟灼，
 * isBefore(ChronoLocalDate other)    boolean    比較當(dāng)前對(duì)象日期是否在other對(duì)象日期之前
 * isAfter(ChronoLocalDate other)    boolean    比較當(dāng)前對(duì)象日期是否在other對(duì)象日期之后
 * isEqual(ChronoLocalDate other)    boolean    比較兩個(gè)日期對(duì)象是否相等
 */
public class DateUtils4Java8 {
    public static final String DATE_FORMAT_FULL = "yyyy-MM-dd HH:mm:ss";

    public static final String DATE_FORMAT_SHORT = "yyyy-MM-dd";

    public static final String DATE_FORMAT_COMPACT = "yyyyMMdd";

    public static final String DATE_FORMAT_COMPACTFULL = "yyyyMMddHHmmss";

    public static final String DATE_FORMAT_FULL_MSEL = "yyyyMMddHHmmssSSSS";

    public static final String DATE_YEAR_MONTH = "yyyyMM";

    public static final String DATE_FORMAT_FULL_MSE = "yyyyMMddHHmmssSSS";


    /**
     * 獲取系統(tǒng)當(dāng)前日期
     *
     * @return
     */
    public static Date getCurrentDate() {
        return new Date();
    }

    /**
     * 獲取系統(tǒng)當(dāng)前日期
     *
     * @return
     */
    public static LocalDateTime getCurrentLocalDateTime() {
        return LocalDateTime.now();
    }

    /**
     * 根據(jù)時(shí)間格式返回對(duì)應(yīng)的String類(lèi)型的時(shí)間
     *
     * @param format
     * @return
     */
    public static String getCurDateTime(String format) {
        LocalDateTime now = LocalDateTime.now();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        String dataTime = now.format(dateTimeFormatter);
        return dataTime;
    }

    /**
     * 得到當(dāng)前日期
     *
     * @return String 當(dāng)前日期 yyyy-MM-dd HH:mm:ss格式
     * @author kevin
     */
    public static String getCurDateTimeFull() {
        return getCurDateTime(DATE_FORMAT_FULL);
    }


    /**
     * 得到當(dāng)前日期
     *
     * @return String 當(dāng)前日期 yyyyMMddHHmmss格式
     * @author kevin
     */
    public static String getCurDateTime1() {
        return getCurDateTime(DATE_FORMAT_FULL);
    }

    /**
     * 得到當(dāng)前日期YYYYMM格式
     *
     * @return String 當(dāng)前日期 yyyyMM格式
     * @author kevin
     */
    public static String getCurDateYYYYMM() {
        return getCurDateTime(DATE_YEAR_MONTH);
    }


    /**
     * 得到當(dāng)前日期
     *
     * @return String 當(dāng)前日期 yyyyMMdd格式
     * @author kevin
     */
    public static String getCurDateYYYYMMDD() {
        return getCurDateTime(DATE_FORMAT_COMPACT);
    }

    /**
     * 判斷是否是今天
     *
     * @param strDate
     * @return
     */
    public static boolean isCurrentDay(String strDate) {
        boolean bRet = false;
        LocalDate strLocalDate = LocalDate.parse(strDate);
        if (LocalDate.now().getYear() == strLocalDate.getYear()) {
            MonthDay monthDay = MonthDay.from(strLocalDate);
            MonthDay today = MonthDay.from(LocalDate.now());
            return monthDay.equals(today);
        }
        return bRet;
    }

    /**
     * 獲取幾小時(shí)后的時(shí)間
     *
     * @param hour
     * @param format
     * @return
     */
    public static String getAfterDateTime(int hour, String format) {
        LocalTime localTime = LocalTime.now().plusHours(hour);
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        String dataTime = localTime.format(dateTimeFormatter);
        return dataTime;
    }


    /**
     * 當(dāng)前日期時(shí)間戳(yyyyMMddHHmmssSSSS)
     *
     * @return
     * @author liangxuekai
     */
    public static String getTimeStamp() {
        LocalDateTime now = LocalDateTime.now();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(DATE_FORMAT_FULL_MSEL);
        return now.format(dateTimeFormatter);
    }

    /**
     * 日期轉(zhuǎn)字符串
     *
     * @return String
     * @author kevin
     */
    public static String parseDateToString(Date thedate, String format) {
        if (thedate != null) {
            Instant instant = thedate.toInstant();
            ZoneId zone = ZoneId.systemDefault();
            LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
            DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
            return localDateTime.format(dateTimeFormatter);
        }
        return null;
    }

    /**
     * parseDateToString(Date thedate, String format)的重載方法
     *
     * @param thedate
     * @return
     */
    public static String parseDateToString(Date thedate) {
        // String format = "yyyy-MM-dd";
        return parseDateToString(thedate, DATE_FORMAT_FULL);
    }

    /**
     * 字符串轉(zhuǎn)日期
     *
     * @return Date
     * @author kevin
     */
    public static Date parseStringToDate(String thedate, String format) {
        DateFormat sdf = new SimpleDateFormat(format);
        Date dd1 = null;
        try {
            dd1 = sdf.parse(thedate);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return dd1;
    }

    /**
     * 由String型日期轉(zhuǎn)成format形式String
     *
     * @param format1 原先格式
     * @param format2 轉(zhuǎn)化格式
     * @return String
     * @author kevin
     */
    public static String changeFormatDateString(String format1, String format2, String strDate) {
        if (strDate == null)
            return "";
        if (strDate.length() >= format1.length() && format1.length() >= format2.length()) {
            return parseDateToString(parseStringToDate(strDate, format1), format2);
        }
        return strDate;
    }

    /**
     * 得到當(dāng)前日期的前N天時(shí)間 yyyymmdd
     *
     * @param format
     * @param day
     * @return
     */
    public static String beforeNDaysDate(String format, int day) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        if (day > 0) {
            return LocalDateTime.now().minusDays(day).format(dateTimeFormatter);
        }
        return null;
    }

    /**
     * 獲得N個(gè)月后的日期
     * <p>
     * theDate 日期
     * <p>
     * int month 月數(shù)
     * <p>
     * format 格式
     */
    public static String afterNMonthDate(String theDate, int month, String format) {

        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        return LocalDateTime.parse(theDate,dateTimeFormatter)
                .plusMonths(month)
                .format(dateTimeFormatter);

    }

    /**
     * 得到N天后的日期
     *
     * @param theDate 某日期
     *                格式 yyyy-MM-dd
     * @param nDayNum N天
     * @return String N天后的日期
     * @author kevin
     */
    public static String afterNDaysDate(String theDate, Integer nDayNum, String format) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);

        return LocalDateTime.parse(theDate,dateTimeFormatter)
                .plusDays(nDayNum)
                .format(dateTimeFormatter);
    }

    /**
     * 得到N小時(shí)后的日期
     *
     * @param theDate  時(shí)間
     * @param nHourNum N小時(shí)數(shù)
     * @param format   時(shí)間格式
     * @return
     */
    public static String afterNHoursDate(String theDate, Integer nHourNum, String format) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        return LocalDateTime.parse(theDate,dateTimeFormatter)
                .plusHours(nHourNum)
                .format(dateTimeFormatter);
    }

    /**
     * 得到N分鐘后的日期
     *
     * @param theDate
     * @param nMinNum
     * @param format
     * @return
     */
    public static String afterNMinsDate(String theDate, Integer nMinNum, String format) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        return LocalDateTime.parse(theDate,dateTimeFormatter)
                .plusMinutes(nMinNum)
                .format(dateTimeFormatter);
    }

    /**
     * 得到N秒后的日期
     * @param theDate
     * @param nSecNum
     * @param format
     * @return
     */
    public static String afterNSecondsDate(String theDate, Integer nSecNum, String format) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
        return LocalDateTime.parse(theDate,dateTimeFormatter)
                .plusSeconds(nSecNum)
                .format(dateTimeFormatter);
    }

    // 比較兩個(gè)字符串格式日期大小,帶格式的日期
    public static boolean isBefore(String strdat1, String strdat2, String format) {
        try {
            Date dat1 = parseStringToDate(strdat1, format);
            Date dat2 = parseStringToDate(strdat2, format);
            return dat1.before(dat2);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    // 比較兩個(gè)字符串格式日期大小,帶格式的日期,返回int
    public static long isBefore_int(String strdat1, String strdat2, String format) {
        long result = 0;
        try {
            Date dat1 = parseStringToDate(strdat1, format);
            Date dat2 = parseStringToDate(strdat2, format);
            return dat2.getTime() - dat1.getTime();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    

    /*
     * 得到上一個(gè)月或者下一個(gè)月的日期
     */
    public static String getDayafterMonth(String theDate, int month, String formatStr) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formatStr);
        return LocalDateTime.parse(theDate).plusMonths(month).format(dateTimeFormatter);
       /* Calendar now = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(formatStr);
        Date dat1 = parseStringToDate(theDate, formatStr);
        now.setTime(dat1);
        sdf.setTimeZone(TimeZone.getDefault());
        now.add(Calendar.MONTH, month);
        return sdf.format(now.getTime());*/
    }

    /**
     * 將秒轉(zhuǎn)換為小時(shí)分秒等
     *
     * @param sec
     * @return
     */
    public String changeTime(int sec) {
        String temp = "";
        if (sec < 60) {
            temp = "" + sec + "秒";
        } else if (sec < 3600) {
            temp = "" + sec / 60 + "分" + sec % 60 + "秒";
        } else {
            temp = "" + sec / 3600 + "小時(shí)" + (sec % 3600) / 60 + "分" + sec % 60 + "秒";
        }
        return temp;
    }

    /**
     * 方法描述:
     * 計(jì)算兩個(gè)日期相差天數(shù)
     *
     * @param end   結(jié)束日期
     * @param start 開(kāi)始日期
     * @return 作者：liangxuekai
     * 日期：2018 2018年1月31日
     */
    public static int getSubDays(String end, String start) {
        LocalDate startDate = LocalDate.parse(start);
        LocalDate endDate = LocalDate.parse(end);
        Long between = ChronoUnit.DAYS.between(startDate, endDate);
        return between.intValue();
    }


    public static String getTimeDiff(Date time1, Date time2) throws Exception {
        long l = time1.getTime() - time2.getTime();
        String returnStr = "";
        long day = l / (24 * 60 * 60 * 1000);
        if (day > 0) {
            returnStr += (day + "天");
        }
        long hour = (l / (60 * 60 * 1000) - day * 24);
        if (hour > 0) {
            returnStr += (hour + "小時(shí)");
        }
        long min = ((l / (60 * 1000)) - day * 24 * 60 - hour * 60);
        if (min > 0) {
            returnStr += (min + "分");
        }
        long s = (l / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
        if (s > 0) {
            returnStr += (s + "秒");
        }
        return returnStr;
    }


}`