Java常见日期格式及日期的计算工具类

package com.java.mvc.util;

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.getInst
4000
ance();
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();
}

// public static void main(String[] args) throws Exception {

// System.out.println(getPreviousMonthOfNextYear());

// System.out.println(getPreviousOrNextDaysOfNow(3));

// System.out.println(getTimeListByParameter(new Date(),1,3));

// }

}