Java对日期Date类进行加减运算、年份加减月份加减、时间差等等

Java对日期Date类进行加减运算、年份加减月份加减、时间差等等

实现代码一：

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class DateTestUtil {

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

SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");

String str="20110823";

Date dt=sdf.parse(str);

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.YEAR,-1);//日期减1年

rightNow.add(Calendar.MONTH,3);//日期加3个月

rightNow.add(Calendar.DAY_OF_YEAR,10);//日期加10天

Date dt1=rightNow.getTime();

String reStr = sdf.format(dt1);

System.out.println(reStr);

}

}

注：在Calendar对象的add方法中，第二个参数为正数表示“加”，负数表示“减”。

代码二： java date 日期加减天数

测试类代码：

import java.text.SimpleDateFormat;

import java.util.Date;

public class DateTest {

public static void main(String[] arg){

Date now = new Date();

addAndSubtractDaysByGetTime(now,-5);

addAndSubtractDaysByGetTime(now,5);

addAndSubtractDaysByCalendar(now,-5);

addAndSubtractDaysByCalendar(now,5);

}

public static Date addAndSubtractDaysByGetTime(Date dateTime/*待处理的日期*/,int n/*加减天数*/){

//日期格式

SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");

SimpleDateFormat dd=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

System.out.println(df.format(new Date(dateTime.getTime() + n * 24 * 60 * 60 * 1000L)));

//System.out.println(dd.format(new Date(dateTime.getTime() + n * 24 * 60 * 60 * 1000L)));

//注意这里一定要转换成Long类型，要不n超过25时会出现范围溢出，从而得不到想要的日期值

return new Date(dateTime.getTime() + n * 24 * 60 * 60 * 1000L);

}

public static Date addAndSubtractDaysByCalendar(Date dateTime/*待处理的日期*/,int n/*加减天数*/){

//日期格式

SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");

SimpleDateFormat dd=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

java.util.Calendar calstart = java.util.Calendar.getInstance();

calstart.setTime(dateTime);

calstart.add(java.util.Calendar.DAY_OF_WEEK, n);

System.out.println(df.format(calstart.getTime()));

//System.out.println(dd.format(calstart.getTime()));

return calstart.getTime();

}

}

运行结果：

2014-10-06

2014-10-16

2014-10-06

2014-10-16

代码三：

在网上查阅资料，加上自己总结的一些关于Date类的工具类。

package com.data.utils;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class DateFormat {

/**

* 日期减几年

*/

public static String dateMinusYear(String str) throws Exception {

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");

Date dt = sdf.parse(str);

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.YEAR, -1);// 日期减1年

Date dt1 = rightNow.getTime();

String reStr = sdf.format(dt1);

return reStr;

}

/**

* 日期加几年

*/

public static String dateAddYear(String str) throws Exception {

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");

Date dt = sdf.parse(str);

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.YEAR, 1);// 日期加1年

Date dt1 = rightNow.getTime();

String reStr = sdf.format(dt1);

return reStr;

}

/**

* 日期减几月

*/

public static String dateMinusMonth(String str) throws Exception {

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");

Date dt = sdf.parse(str);//将字符串生成Date

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);//使用给定的 Date 设置此 Calendar 的时间。

rightNow.add(Calendar.MONTH, -1);// 日期减1个月

Date dt1 = rightNow.getTime();//返回一个表示此 Calendar 时间值的 Date 对象。

String reStr = sdf.format(dt1);//将给定的 Date 格式化为日期/时间字符串，并将结果添加到给定的 StringBuffer。

return reStr;

}

/**

* 日期加几月

*/

public static String dateAddMonth(String str) throws Exception {

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");

Date dt = sdf.parse(str);

Calendar rightNow = Calendar.getInstance();

rightNow.setTime(dt);

rightNow.add(Calendar.MONTH, 1);// 日期加3个月

// rightNow.add(Calendar.DAY_OF_YEAR,10);//日期加10天

Date dt1 = rightNow.getTime();

String reStr = sdf.format(dt1);

return reStr;

}

/**

* 获取当前年月的第一个月的str

* @param str

* 201505

* @return 201501

* @throws Exception

*/

public static String dateOneMonth(String str) {

str = str.substring(0, str.length() - 2);

str = str + "01";

return str;

}

/**

* 算出所选月份距离一月份有几个月。

* @param str 201509

* @return 9

*/

public static int dateDistanceMonth(String str) {

int i = Integer.parseInt(str);

int j = Integer.parseInt(DateFormat.dateOneMonth(str));

System.out.println(i - j);

return i - j + 1;

}

/**

* 获取两个时间的时间差，精确到毫秒

* @param str

* @return

*/

public static String TimeDifference(long start, long end) {

long between = end - start;

long day = between / (24 * 60 * 60 * 1000);

long hour = (between / (60 * 60 * 1000) - day * 24);

long min = ((between / (60 * 1000)) - day * 24 * 60 - hour * 60);

long s = (between / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);

long ms = (between - day * 24 * 60 * 60 * 1000 - hour * 60 * 60 * 1000

- min * 60 * 1000 - s * 1000);

String timeDifference = day + "天" + hour + "小时" + min + "分" + s + "秒" + ms

+ "毫秒";

return timeDifference;

}

}

/**

* 获取24小时、一周、一个月的起始时间

*

* @param timeInterval

* : DAY_TIME_INTERVAL WEEK_TIME_INTERVAL MONTH_TIME_INTERVAL

* @return "yyyy-mm-dd hh:mm:ss"

*/

public static String getStartTime(int timeInterval) {

Calendar cal = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

if (DAY_TIME_INTERVAL == timeInterval) {// 获取24小时的起始时间

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

String startTime = sdf.format(cal.getTime());

return startTime;

} else if (WEEK_TIME_INTERVAL == timeInterval) {

int weekday = cal.get(Calendar.DAY_OF_WEEK) - 1;

cal.add(Calendar.DATE, -weekday);

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

String startTime = sdf.format(cal.getTime());

return startTime;

} else if (MONTH_TIME_INTERVAL == timeInterval) {

int dayofmonthMin = cal.getActualMinimum(Calendar.DAY_OF_MONTH);

// c.add(Calendar.DATE, -dayofmonth);

cal.set(Calendar.DATE, dayofmonthMin);

cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0);

String startTime = sdf.format(cal.getTime());

return startTime;

}

return null;

}

/**

* 获取24小时、一周、一个月的结束时间

*

* @param timeInterval

* : DAY_TIME_INTERVAL WEEK_TIME_INTERVAL MONTH_TIME_INTERVAL

* @return "yyyy-mm-dd hh:mm:ss"

*/

public static String getEndTime(int timeInterval) {

Calendar cal = Calendar.getInstance();

cal.setTimeZone(TimeZone.getTimeZone("GMT+8"));

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

if (DAY_TIME_INTERVAL == timeInterval) {

cal.set(Calendar.HOUR_OF_DAY, 23);

cal.set(12, 59);

cal.set(13, 59);

long date = cal.getTimeInMillis();

String endTime = sdf.format(new Date(date));

return endTime;

} else if (WEEK_TIME_INTERVAL == timeInterval) {

int weekday = cal.get(Calendar.DAY_OF_WEEK) - 1;

cal.add(Calendar.DATE, -weekday);

cal.add(Calendar.DATE, 6);

cal.set(Calendar.HOUR_OF_DAY, 23);

cal.set(12, 59);

cal.set(13, 59);

long date = cal.getTimeInMillis();

String endTime = sdf.format(new Date(date));

return endTime;

} else if (MONTH_TIME_INTERVAL == timeInterval) {

int dayOfMonthMax = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

cal.set(Calendar.DATE, dayOfMonthMax);

cal.set(Calendar.HOUR_OF_DAY, 23);

cal.set(Calendar.MINUTE, 59);

cal.set(Calendar.SECOND, 59);

String endTime = sdf.format(cal.getTime());

return endTime;

}

return null;

}

/**

* 判断dateStr是否在start和end中间，start和end都可以为null yyyyMMddHHmmss或者yyyyMMdd格式

*

* @author you.xu

* @date 2015年APlUrZow8月19日下午3:11:46

* @param dateStr

* @param start

* @param end

* @return

*/

public static boolean checkDateVal(String dateStr, String start, String end) {

boolean isDateRight = false;

Date date = null;

Date startDate = null;

Date endDate = null;

SimpleDateFormat sdf = null;

// 判断日期格式

if (14 == dateStr.length()) {

sdf = new SimpleDateFormat("yyyyMMddHHmmss");

} else if (8 == dateStr.length()) {

sdf = new SimpleDateFormat("yyyyMMdd");

} else

return false;

try {

// 更改判断日期格式

date = sdf.parse(dateStr);

} catch (ParseException e) {

log.error(e, e);

}

if ((start == null) && (end != null)) {

try {

endDate = sdf.parse(end);

} catch (ParseException ex1) {

log.error(ex1, ex1);

}

if ((date != null) && (endDate != null))// Check parameters for

{

if (date.compareTo(endDate) <= 0)

isDateRight = true;

}

} else if ((start != null) && (end == null)) {

try {

startDate = sdf.parse(start);

} catch (ParseException ex1) {

log.error(ex1, ex1);

}

if ((date != null) && (startDate != null)) {

if (date.compareTo(startDate) >= 0)

isDateRight = true;

}

} else if ((start != null) && (end != null)) {

try {

startDate = sdf.parse(start);

endDate = sdf.parse(end);

} catch (ParseException ex2) {

System.out.println(ex2.toString());

}

if ((startDate != null) && (date != null) && (endDate != null)) {

if ((date.compareTo(startDate) >= 0)

&& (date.compareTo(endDate) <= 0))

isDateRight = true;

}

}

return isDateRight;

}

/**

* 判断dateStr是否在start和end中间，start和end都可以为null long形格式

*

* @author you.xu

* @date 2015年8月19日下午3:12:35

* @param dateStr

* @param start

* @param end

* @return

*/

public static boolean checkDateV(String dateStr, String start, String end) {

boolean isDateRight = false;

long date = -1;

long fromDate = -1;

long toDate = -1;

date = java.lang.Long.parseLong(dateStr);

if ((start == null) && (end == null)) {

isDateRight = true;

} else if ((start == null) && (end != null)) {

try {

toDate = java.lang.Long.parseLong(end);

} catch (NumberFormatException nfe) {

log.error(nfe, nfe);

}

if (date <= toDate) {

isDateRight = truhttp://e;

}

} else if ((start != null) && (end == null)) {

try {

fromDate = java.lang.Long.parseLong(start);

} catch (NumberFormatException nfe) {

log.error(nfe, nfe);

}

if (date >= fromDate) {

isDateRight = true;

}

} else if ((start != null) && (end != null)) {

try {

toDate = java.lang.Long.parseLong(end);

fromDate = java.lang.Long.parseLong(start);

} catch (NumberFormatException nfe) {

log.error(nfe, nfe);

}

if ((date <= toDate) && (date >= fromDate)) {

isDateRight = true;

}

}

return isDateRight;

}

目前就用到了这些，随时添加，有简单方便的时间工具类，希望和大家一起学习，在评论中指出。thanks！！！

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