日期幫助類

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

public class DateUtils {

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

    public final static String FORMAT_YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd hh:mm:ss";

    public final static String FORMAT_YYYYMMDD = "yyyyMMdd";

    public final static String FORMAT_YYYYMM = "yyyyMM";

    public final static String FORMAT_YYYY = "yyyy";

    public final static String FORMAT_YYYYMMDDHHMISS = "yyyyMMdd HH:mm:ss";

    public final static String FORMAT_YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    public final static String FORMAT_YYYY_MM_DD_HH_MI_SS = "yyyy-MM-dd HH:mm:ss";

    public final static String FORMAT_YYYY_MM_DD_HH_MI_SS_SSS = "yyyy-MM-dd HH:mm:ss:SSS";

    public final static String FORMAT_YYYY_MM = "yyyy-MM";

    public final static String FORMAT_DD_HH_MM_SS = "dd HH:mm:ss";

    public final static String FORMAT_HH_MM_SS = "HH:mm:ss";

    public static final int USE_YEAR = 1;

    public static final int USE_MONTH = 2;

    public static final int USE_DAY = 3;

    /**
     * 根據相應的格式初始化日期格式對象
     * @param pattern
     * @return
     */
    public static DateFormat getDateFormat(final String pattern) {
        return new SimpleDateFormat(pattern);
    }

    /**
     * 獲取距離當前日期第N天的日期，若爲days>0則爲當前日期後幾天，否則爲前幾天
     * @param days
     * @return
     */
    public static Date getPreviousOrNextDaysOfNow(int days) {
        return getPreviousOrNextDaysOfDate(new Date(), days);
    }

    /**
     * 返回當前日期的 格式爲： format(yyyy-MM-dd)
     * @return
     */
    public static String getCurrentDate() {
        Date now = new Date();
        return getDateFormat(FORMAT_YYYY_MM_DD).format(now);
    }

    /**
     * 返回指定日期和指定格式日期字符串
     * @return
     */
    public static String getSpecifyDate(Date date,String pattern) {
        return getDateFormat(pattern).format(date);
    }

    /**
     * 返回當前日期的 格式爲： format(yyyy-MM-dd HH:MM:SS)
     * @return
     */
    public static String getCurrentDateTime() {
        Date now = new Date();
        return getDateFormat(FORMAT_YYYY_MM_DD_HH_MM_SS).format(now);
    }

    /**
     * Current date with format(yyyy-MM-dd HH:MM:SS:SSS)
     * @return
     */
    public static String getCurrentDateTimeMilliSecond(Date date) {
        return getDateFormat(FORMAT_YYYY_MM_DD_HH_MI_SS_SSS).format(date);
    }

    /**
     * 根據相應時間格式(yyyy-MM-dd HH:MM:SS:SSS)字符串轉換爲Date
     * @return
     */
    public static Date getDateByTimeMilliSecond(String date) throws ParseException{
        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_YYYY_MM_DD_HH_MI_SS_SSS);
        return sdf.parse(date);
    }

    /**
     * 根據相應時間格式字符串轉換爲Date
     * @return
     */
    public static Date getDateByPattern(String date,String pattern) throws ParseException{
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.parse(date);
    }

    /**
     * 獲取當月的第一天
     * @return
     */
    public static Date getFirstDayOfThisMonth() {
        Calendar nowday = Calendar.getInstance();
        nowday.set(Calendar.DAY_OF_MONTH, 1);
        nowday.set(Calendar.HOUR_OF_DAY, 0);
        nowday.set(Calendar.MINUTE, 0);
        nowday.set(Calendar.SECOND, 0);
        nowday.set(Calendar.MILLISECOND, 0);
        return nowday.getTime();
    }

    /**
     * 得到當前日期的上月日期
     * @return
     */
    public static Date getLastMonth() {
        Calendar nowday = Calendar.getInstance();
        nowday.setTime(new Date());
        nowday.set(Calendar.DAY_OF_MONTH, 1);
        nowday.add(Calendar.MONTH, -1);
        return nowday.getTime();
    }


    public static Date getLastDayByCalendar(Calendar calendar) {
        calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        return calendar.getTime();
    }



    /**
     * 判斷指定日期是否在當前N天內
     * @param old
     * @param days
     * @return
     */
    public static boolean isDaysInterval(Date old, int days) {
        Calendar now = Calendar.getInstance();
        return (now.getTimeInMillis() - old.getTime()) <= days * 24 * 3600 * 1000;
    }
    /**
     * 根據日曆獲取相應月份的第一天
     * @param calendar
     * @return
     */
    public static Date getFirstDayOfTheMonth(Calendar calendar) {
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    /**
     * 獲取指定日期之前或者之後的日期
     * @param days Day
     * @return
     */
    public static Date getPreviousOrNextDaysOfDate(Date date, int days) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DAY_OF_YEAR, days);
        return calendar.getTime();
    }

    /**
     * 獲取與指定日期相差月份數的相同日期
     * @param date
     * @param month
     * @return
     */
    public static Date getPreviousOrNextMonthsOfDate(Date date, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, month);
        return calendar.getTime();
    }

    /**
     * 獲取與指定日期相差年份數的相同日期
     * @param date
     * @param month
     * @return
     */
    public static Date getPreviousOrNextYearsOfDate(Date date, int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.YEAR, year);
        return calendar.getTime();
    }

    /**
     * 得到當前日期的開始時間
     * @return
     */
    public static Date getBeginOfCurrentDay() {
        return getBeginOfTheDate(new Date());
    }

    /**
     * 得到當前日期的結束時間
     * @return
     */
    public static Date getEndOfCurrentDay() {
        return getEndOfTheDate(new Date());
    }

    public static long getDifferenceDays(Calendar beginCalender, Calendar endCalendar) {
        long days = (endCalendar.getTimeInMillis() - beginCalender.getTimeInMillis()) / (24 * 60 * 60 * 1000);
        days = days + 1;
        return days;
    }

    /**
     * 獲取當前年份的第一天
     * @return
     */
    public static Date getBeginOfCurrentYear() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    /**
     * 獲取當前時間 的前後N分鐘
     * @param date
     * @param minute
     * @return
     */
    public static Date getPreviousOrNextMinutesOfDate(Date date, int minute) {
        Calendar now = Calendar.getInstance();
        now.setTime(date);
        now.add(Calendar.MINUTE, minute);
        return now.getTime();
    }


    /**
     * 得到指定月份的最後時刻
     * @param date
     * @return
     */
    public static Date getLastDateOfTheMonth(Date date) {
        Calendar newday = Calendar.getInstance();
        newday.setTime(date);
        newday.set(Calendar.DAY_OF_MONTH, newday.getActualMaximum(Calendar.DAY_OF_MONTH));
        newday.set(Calendar.HOUR_OF_DAY, 23);
        newday.set(Calendar.MINUTE, 59);
        newday.set(Calendar.SECOND, 59);
        newday.set(Calendar.MILLISECOND, 999);
        return newday.getTime();
    }


    public static Date getBeginOfTheDate(Date date) {
        Calendar nowday = Calendar.getInstance();
        nowday.setTime(date);
        nowday.set(Calendar.HOUR_OF_DAY, 0);
        nowday.set(Calendar.MINUTE, 0);
        nowday.set(Calendar.SECOND, 0);
        nowday.set(Calendar.MILLISECOND, 0);
        return nowday.getTime();
    }


    public static Date getEndOfTheDate(Date date) {
        Calendar nowday = Calendar.getInstance();
        nowday.setTime(date);
        nowday.set(Calendar.HOUR_OF_DAY, 23);
        nowday.set(Calendar.MINUTE, 59);
        nowday.set(Calendar.SECOND, 59);
        nowday.set(Calendar.MILLISECOND, 998);//Sql Server BUG
        return nowday.getTime();
    }

    /**
     * 獲取指定時間段內所有的天數集合
     * @param beginDate
     * @param endDate
     * @return
     * @throws Exception
     */
    public static List<String> getAreaTime(String beginDate, String endDate) throws Exception {
        List<String> timeList = new ArrayList<String>();
        if (endDate == null || "".equals(endDate)) {
            timeList.add(beginDate);
            return timeList;
        }
        // day
        if (beginDate.length() <= 7) {
            return getAreaMonthTime(beginDate, endDate);
            // month
        } else {
            return getAreaDayTime(beginDate, endDate);
        }
    }

    private static List<String> getAreaMonthTime(String beginMonth, String endMonth) throws Exception {
        Date parsedBeginMonth = getDateFormat(FORMAT_YYYY_MM).parse(beginMonth);
        String tempStr = "";
        List<String> timeList = new ArrayList<String>();
        int months = 0;
        while (!endMonth.equals(tempStr)) {
            tempStr = getDateFormat(FORMAT_YYYY_MM).format(getPreviousOrNextMonthsOfDate(parsedBeginMonth, months));
            timeList.add(tempStr);
            months++;
        }
        return timeList;
    }

    /**
     * 獲取指定時間段內所有的天數集合
     * @param beginDate
     * @param endDate
     * @return
     * @throws Exception
     */
    public static List<String> getAreaDayTime(String beginDate, String endDate) throws Exception {
        Date parsedBeginMonth = getDateFormat(FORMAT_YYYY_MM_DD).parse(beginDate);
        String tempStr = "";
        List<String> timeList = new ArrayList<String>();
        int months = 0;
        while (!endDate.equals(tempStr)) {
            tempStr = getDateFormat(FORMAT_YYYY_MM_DD).format(getPreviousOrNextDaysOfDate(parsedBeginMonth, months));
            timeList.add(tempStr);
            months++;
        }
        return timeList;
    }

    /**
     * 獲取當前日期前一天的相應日期的Long形式如20160227
     * @return
     */
    public static Long getPreviousDay() {
        Date date = getPreviousOrNextDaysOfDate(new Date(), -1);
        return Long.valueOf((getDateFormat(FORMAT_YYYYMMDD).format(date)));
    }

    /**
     * 獲取指定日期前一天的相應日期的Long形式如20160227
     * @return
     */
    public static Long getPreviousDay(Date date,int days) {
        Date dates = getPreviousOrNextDaysOfDate(date, days);
        return Long.valueOf((getDateFormat(FORMAT_YYYYMMDD).format(dates)));
    }

    /**
     * 獲取指定日期前N月或者後N月的相同日期字符串
     * @param date
     * @param n
     * @return
     * @throws Exception
     */
    public static String getPreviousOrNextMonthsOfTheMonth(String date, int n) throws Exception {
        Calendar calendar = new GregorianCalendar();
        DateFormat dateFormat = getDateFormat(FORMAT_YYYYMM);
        calendar.setTime(dateFormat.parse(date));
        calendar.add(Calendar.MONTH, n);
        return dateFormat.format(calendar.getTime());
    }


    public static String getPreviousOrNextDaysOfTheDay(String date, int days) throws Exception {
        Calendar calendar = new GregorianCalendar();
        DateFormat dateFormat = getDateFormat(FORMAT_YYYYMMDD);
        calendar.setTime(dateFormat.parse(date));
        calendar.add(Calendar.DAY_OF_MONTH, days);
        return dateFormat.format(calendar.getTime());
    }

    public static Long getFirstDayOfCurrentMonth() {
        Date date = getFirstDayOfThisMonth();
        String dateStr = getDateFormat(FORMAT_YYYYMMDD).format(date);
        return Long.valueOf(dateStr);
    }

    public static Long getFirstMonthOfNow() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.MONTH, 0);
        return Long.valueOf(getDateFormat(FORMAT_YYYYMM).format(calendar.getTime()));
    }

    public static Integer getCurrentDay() {
        Date date = new Date();
        return Integer.parseInt(getDateFormat(FORMAT_YYYYMMDD).format(date));
    }

    public static Integer getCurrentMonth() {
        Date date = new Date();
        return Integer.parseInt(getDateFormat(FORMAT_YYYYMM).format(date));
    }

    public static Integer getCurrentYear() {
        Date date = new Date();
        return Integer.parseInt(getDateFormat(FORMAT_YYYY).format(date));
    }

    public static Integer getKpiDbAnyOffsetDayOfNow(int day) {
        Calendar nowday = Calendar.getInstance();
        nowday.set(Calendar.DAY_OF_YEAR, nowday.get(Calendar.DAY_OF_YEAR) + day);
        return Integer.parseInt(getDateFormat(FORMAT_YYYYMMDD).format(nowday.getTime()));
    }

    /**
     * 得到當前日期下一年的上個月
     * @return
     */
    public static Long getPreviousMonthOfNextYear() {
        Calendar nowday = Calendar.getInstance();
        nowday.setTime(new Date());
        nowday.set(Calendar.DAY_OF_MONTH, 1);
        nowday.add(Calendar.YEAR, +1);
        nowday.add(Calendar.MONTH, -1);
        Long time = Long.valueOf(getDateFormat(FORMAT_YYYYMM).format(nowday.getTime()));
        return time;
    }

    /**
     * 獲取指定日期下個月的相同日期
     * @param date
     * @return
     */
    public static Long getTheSameDayOfTheNextMonth(Date date) {
        Date next = getPreviousOrNextMonthsOfDate(date, 1);
        Long time = Long.valueOf(getDateFormat(FORMAT_YYYYMMDD).format(next));
        return time;
    }

    /**
     * 獲取當前日期下個月的相同日期
     * @param date
     * @return
     */
    public static Long getTheSameDayOfNextMonth() {
        return getTheSameDayOfTheNextMonth(new Date());
    }

    public static Long getPreviousYear() {
        Calendar nowday = Calendar.getInstance();
        nowday.setTime(new Date());
        nowday.add(Calendar.YEAR, -1);
        return Long.valueOf(getDateFormat(FORMAT_YYYY).format(nowday.getTime()));
    }

    public static List<String> getTimeListByParameter(Date paramDate, int paramter, int type) {
        if (type == USE_YEAR) {
            Date newDate = getPreviousOfNextYearOfDate(paramDate, -paramter);
            return getDaysBetweenDate(paramDate, newDate);
        } else if (type == USE_MONTH) {
            Date newDate = getPreviousOrNextMonthsOfDate(paramDate, paramter);
            return getDaysBetweenDate(paramDate, newDate);
        } else {
            return getDaysByBeginDate(paramDate, paramter);
        }
    }

    private static Date getPreviousOfNextYearOfDate(Date date, int year) {
        Calendar now = Calendar.getInstance();
        now.setTime(date);
        now.add(Calendar.YEAR,year);
        return now.getTime();
    }

    private static List<String> getDaysBetweenDate(Date paramDate, Date newDate) {
        DateFormat dateFormat = getDateFormat(FORMAT_YYYYMMDD);
        String formatNewDate = dateFormat.format(newDate);
        String tempStr = "";
        List<String> timeList = new ArrayList<String>();
        int days = 0;
        while (!formatNewDate.equals(tempStr)) {
            tempStr = dateFormat.format(getPreviousOrNextDaysOfDate(paramDate, -days));
            timeList.add(tempStr);
            days++;
        }
        return timeList;
    }

    private static List<String> getDaysByBeginDate(Date paramDate, int paramter) {
        List<String> timeList = new ArrayList<String>();
        for (int i = 1; i <= paramter; i++) {
            timeList.add(getDateFormat(FORMAT_YYYYMMDD).format(getPreviousOrNextDaysOfDate(paramDate, -i)));
        }
        return timeList;
    }


    public static Long getFirstMonthOfCurrentYear() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.MONTH,0);
        return Long.valueOf(getDateFormat(FORMAT_YYYYMM).format(calendar.getTime()));
    }

    public static Date getPreviousOrNextMonthsOfDateTime(Date date, int months){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, months);
        return calendar.getTime();
    }

    /**
     * 獲取指定日期的前後N天的日期字符串
     * @param ymd
     * @param days
     * @return
     * @throws ParseException
     */
    public static String  getPreviousOrNextDaysOfNow(String ymd,int days) throws ParseException {
        Date date = getDateFormat(FORMAT_YYYY_MM_DD).parse(ymd);
        Date result = getPreviousOrNextDaysOfDate(date, days);
        return getDateFormat(FORMAT_YYYY_MM_DD).format(result);
    }

    public static Date getBeginOfThePreviousOrNextMonths(int month){
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MONTH, month);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    public static Date getPreviousOrNextWorkDaysOfDate(Date date, int days) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int step = 0;
        if(days>0){
            step = 1;
        }else{
            step = -1;
        }
        for(int i = 0; i < Math.abs(days) ; ){
            calendar.add(Calendar.DAY_OF_YEAR, step);
            if(calendar.get(Calendar.DAY_OF_WEEK)==Calendar.SATURDAY||calendar.get(Calendar.DAY_OF_WEEK)==Calendar.SUNDAY){
                continue;
            }
            i++;
        }
        return calendar.getTime();
    }

    public static Date getBeginDateOfTheMonth(Date date) {
        Calendar newday = Calendar.getInstance();
        newday.setTime(date);
        newday.set(Calendar.DAY_OF_MONTH, 1);
        newday.set(Calendar.HOUR_OF_DAY, 0);
        newday.set(Calendar.MINUTE, 0);
        newday.set(Calendar.SECOND, 0);
        newday.set(Calendar.MILLISECOND, 0);
        return newday.getTime();
    }

}