Java常见日期格式及日期的计算工具类

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;
/**
* 根据相应的格式初始化日期格式对象
* @param pattern
* @return
*/
public static DateFormat getDateFormat(final String pattern) {
   return new SimpleDateFormat(pattern);
}
/**
* 获取距离当前日期第N天的日期，若为days>0则为当前日期后几天，否则为前几天
* @param days
* @return
*/
public static Date getPreviousOrNextDaysOfNow(int days) {
   return getPreviousOrNextDaysOfDate(new Date(), days);
}/**
* 返回当前日期的 格式为： 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);
}/**
* 返回当前日期的 格式为： 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);
}/**
* 根据相应时间格式(yyyy-MM-dd HH:MM:SS:SSS)字符串转换为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);
}/**
* 根据相应时间格式字符串转换为Date
* @return
*/
public static Date getDateByPattern(String date,String pattern) throws ParseException{
   SimpleDateFormat sdf = new SimpleDateFormat(pattern);
   return sdf.parse(date);
}/**
* 获取当月的第一天
* @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();
}
/**
* 得到当前日期的上月日期
* @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();
}/**
* 判断指定日期是否在当前N天内
* @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;
}
/**
* 根据日历获取相应月份的第一天
* @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();
}/**
* 获取指定日期之前或者之后的日期
* @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();
}/**
* 获取与指定日期相差月份数的相同日期
* @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();
}
/**
* 获取与指定日期相差年份数的相同日期
* @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();
}/**
* 得到当前日期的开始时间
* @return
*/
public static Date getBeginOfCurrentDay() {
   return getBeginOfTheDate(new Date());
}/**
* 得到当前日期的结束时间
* @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;
}/**
* 获取当前年份的第一天
* @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();
}/**
* 获取当前时间 的前后N分钟
* @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();
}/**
* 得到指定月份的最后时刻
* @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();
}/**
* 获取指定时间段内所有的天数集合
* @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;
}/**
* 获取指定时间段内所有的天数集合
* @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;
}/**
* 获取当前日期前一天的相应日期的Long形式如20160227
* @return
*/
public static Long getPreviousDay() {
   Date date = getPreviousOrNextDaysOfDate(new Date(), -1);
   return Long.valueOf((getDateFormat(FORMAT_YYYYMMDD).format(date)));
}/**
* 获取指定日期前一天的相应日期的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)));
}/**
* 获取指定日期前N月或者后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()));
}/**
* 得到当前日期下一年的上个月
* @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;
}/**
* 获取指定日期下个月的相同日期
* @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;
}/**
* 获取当前日期下个月的相同日期
* @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();
}/**
* 获取指定日期的前后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();
}