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如何在 Java 中向当前日期添加一个月？

发布于 2024-10-16 08:46:08 字数 27 浏览 2 评论 0 原文

在Java中如何在当前日期上添加一个月？

原文

In Java how can I add one month to the current date?

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羞稚 2024-10-23 08:46:08 
Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);

Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);
回复 原文
半城柳色半声笛 2024-10-23 08:46:08

Java 8

LocalDate futureDate = LocalDate.now().plusMonths(1);

Java 8

LocalDate futureDate = LocalDate.now().plusMonths(1);
回复 原文
爱你是孤单的心事 2024-10-23 08:46:08

您可以使用 apache 的 commons lang DateUtils 帮助实用程序类。

Date newDate = DateUtils.addMonths(new Date(), 1);

您可以在 http://commons.apache.org/proper/commons-lang/ 下载 commons lang jar

You can make use of apache's commons lang DateUtils helper utility class.

Date newDate = DateUtils.addMonths(new Date(), 1);

You can download commons lang jar at http://commons.apache.org/proper/commons-lang/

回复 原文
山色无中 2024-10-23 08:46:08

tl;dr

LocalDate::plusMonths

示例：

LocalDate.now( )
         .plusMonths( 1 );

最好指定时区。

LocalDate.now( ZoneId.of( "America/Montreal" )
         .plusMonths( 1 );

java.time

java.time 框架内置于 Java 8 及更高版本中。这些类取代了旧的麻烦的日期时间类，例如 java.util.Date、.Calendar 和 & 。 java.text.SimpleDateFormat。 Joda-Time 团队还建议迁移到 java.time。

要了解更多信息，请参阅 Oracle 教程。并在 Stack Overflow 上搜索许多示例和解释。

许多 java.time 功能都向后移植到 Java 6 和 Java 6。 ThreeTen-Backport 中的 7 并在 ThreeTenABP。

仅日期

如果您想要仅日期，请使用 LocalDate 类。

ZoneId z = ZoneId.of( "America/Montreal" );
 LocalDate today = LocalDate.now( z );

tod​​ay.toString(): 2017-01-23

添加一个月。

LocalDate oneMonthLater = today.plusMonths( 1 );

oneMonthLater.toString(): 2017-02-23

日期时间

也许您想要一个时间和日期。

首先获取 UTC 中的当前时刻，分辨率为 纳秒。

Instant instant = Instant.now();

添加月份意味着确定日期。确定日期意味着应用时区。对于任何特定时刻，世界各地的日期都会有所不同，新的一天在东方黎明较早。因此，将 Instant 调整为时区。

ZoneId zoneId = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt = ZonedDateTime.ofInstant( instant , zoneId );

现在添加您的月份。让 java.time 处理闰月，以及月份长度不同的事实。

ZonedDateTime zdtMonthLater = zdt.plusMonths( 1 );

在进行此类计算时，您可能需要将时间调整为一天中的第一时刻。第一个时刻并不总是00:00:00.0，因此让 java.time 确定一天中的时间。

ZonedDateTime zdtMonthLaterStartOfDay = zdtMonthLater.toLocalDate().atStartOfDay( zoneId );

关于 java.time

java.time 框架内置于 Java 8 及更高版本中。这些类取代了麻烦的旧遗留日期时间类，例如java.util.Date, 日历, & SimpleDateFormat 。

要了解更多信息，请参阅 Oracle 教程。并在 Stack Overflow 上搜索许多示例和解释。规范为 JSR 310。

Joda-Time 项目，现已在 维护模式，建议迁移到 java.time 类。

您可以直接与数据库交换java.time对象。使用符合 JDBC 驱动程序 /jeps/170" rel="nofollow noreferrer">JDBC 4.2 或更高版本。不需要字符串，不需要 java.sql.* 类。 Hibernate 5 和 Hibernate 5 JPA 2.2 支持 java.time。

从哪里获取 java.time 类？

Joda-Time

更新：Joda-Time 项目现已处于维护模式。其团队建议迁移到 java.time 类。我将把这一部分完整地留给后代。

Joda-Time 库提供了一种以智能方式添加月份的方法。

DateTimeZone timeZone = DateTimeZone.forID( "Europe/Paris" );
DateTime now = DateTime.now( timeZone );
DateTime nextMonth = now.plusMonths( 1 );

您可能想通过将时间调整为一天中的第一时刻来专注于这一天。

DateTime nextMonth = now.plusMonths( 1 ).withTimeAtStartOfDay();

tl;dr

LocalDate::plusMonths

Example:

LocalDate.now( )
         .plusMonths( 1 );

Better to specify time zone.

LocalDate.now( ZoneId.of( "America/Montreal" )
         .plusMonths( 1 );

java.time

The java.time framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as java.util.Date, .Calendar, & java.text.SimpleDateFormat. The Joda-Time team also advises migration to java.time.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations.

Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP.

Date-only

If you want the date-only, use the LocalDate class.

ZoneId z = ZoneId.of( "America/Montreal" );
 LocalDate today = LocalDate.now( z );

today.toString(): 2017-01-23

Add a month.

LocalDate oneMonthLater = today.plusMonths( 1 );

oneMonthLater.toString(): 2017-02-23

Date-time

Perhaps you want a time-of-day along with the date.

First get the current moment in UTC with a resolution of nanoseconds.

Instant instant = Instant.now();

Adding a month means determining dates. And determining dates means applying a time zone. For any given moment, the date varies around the world with a new day dawning earlier to the east. So adjust that Instant into a time zone.

ZoneId zoneId = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt = ZonedDateTime.ofInstant( instant , zoneId );

Now add your month. Let java.time handle Leap month, and the fact that months vary in length.

ZonedDateTime zdtMonthLater = zdt.plusMonths( 1 );

You might want to adjust the time-of-day to the first moment of the day when making this kind of calculation. That first moment is not always 00:00:00.0 so let java.time determine the time-of-day.

ZonedDateTime zdtMonthLaterStartOfDay = zdtMonthLater.toLocalDate().atStartOfDay( zoneId );

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.

Where to obtain the java.time classes?

Joda-Time

Update: The Joda-Time project is now in maintenance mode. Its team advises migration to the java.time classes. I am leaving this section intact for posterity.

The Joda-Time library offers a method to add months in a smart way.

DateTimeZone timeZone = DateTimeZone.forID( "Europe/Paris" );
DateTime now = DateTime.now( timeZone );
DateTime nextMonth = now.plusMonths( 1 );

You might want to focus on the day by adjust the time-of-day to the first moment of the day.

DateTime nextMonth = now.plusMonths( 1 ).withTimeAtStartOfDay();
回复 原文
故事未完 2024-10-23 08:46:08 
Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);
java.util.Date dt = cal.getTime();

Calendar cal = Calendar.getInstance(); 
cal.add(Calendar.MONTH, 1);
java.util.Date dt = cal.getTime();
回复 原文
倾｀听者〃 2024-10-23 08:46:08

（改编自杜古）

public static Date addOneMonth(Date date)
{
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(Calendar.MONTH, 1);
    return cal.getTime();
}

(adapted from Duggu)

public static Date addOneMonth(Date date)
{
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(Calendar.MONTH, 1);
    return cal.getTime();
}
回复 原文
情域 2024-10-23 08:46:08

您可以使用 org.apache.commons.lang3.time 包中的 DateUtils 类

DateUtils.addMonths(new Date(),1);

you can use DateUtils class in org.apache.commons.lang3.time package

DateUtils.addMonths(new Date(),1);
回复 原文
公布 2024-10-23 08:46:08

使用 calander 并尝试此代码。

Calendar calendar = Calendar.getInstance();         
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date nextMonthFirstDay = calendar.getTime();
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();

Use calander and try this code.

Calendar calendar = Calendar.getInstance();         
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
Date nextMonthFirstDay = calendar.getTime();
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
Date nextMonthLastDay = calendar.getTime();
回复 原文
巷雨优美回忆 2024-10-23 08:46:08 
public Date  addMonths(String dateAsString, int nbMonths) throws ParseException {
        String format = "MM/dd/yyyy" ;
        SimpleDateFormat sdf = new SimpleDateFormat(format) ;
        Date dateAsObj = sdf.parse(dateAsString) ;
        Calendar cal = Calendar.getInstance();
        cal.setTime(dateAsObj);
        cal.add(Calendar.MONTH, nbMonths);
        Date dateAsObjAfterAMonth = cal.getTime() ;
    System.out.println(sdf.format(dateAsObjAfterAMonth));
    return dateAsObjAfterAMonth ;
}`

public Date  addMonths(String dateAsString, int nbMonths) throws ParseException {
        String format = "MM/dd/yyyy" ;
        SimpleDateFormat sdf = new SimpleDateFormat(format) ;
        Date dateAsObj = sdf.parse(dateAsString) ;
        Calendar cal = Calendar.getInstance();
        cal.setTime(dateAsObj);
        cal.add(Calendar.MONTH, nbMonths);
        Date dateAsObjAfterAMonth = cal.getTime() ;
    System.out.println(sdf.format(dateAsObjAfterAMonth));
    return dateAsObjAfterAMonth ;
}`
回复 原文
咽泪装欢 2024-10-23 08:46:08

如果您需要一行（即 Jasper Reports 公式）并且不介意调整是否不是一个月（即“30 天”就足够了）：

new Date($F{invoicedate}.getTime ()+30L*24L*60L*60L*1000L)

If you need a one-liner (i.e. for Jasper Reports formula) and don't mind if the adjustment is not exactly one month (i.e "30 days" is enough):

new Date($F{invoicedate}.getTime() + 30L * 24L * 60L * 60L * 1000L)

回复 原文
宫墨修音 2024-10-23 08:46:08

此方法返回当前日期加上 1 个月。

public Date  addOneMonth()  {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.MONTH, 1);
        return cal.getTime();
}`

This method returns the current date plus 1 month.

public Date  addOneMonth()  {
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.MONTH, 1);
        return cal.getTime();
}`
回复 原文
风轻花落早 2024-10-23 08:46:08 
 public Date addMonth(Date inputDate, int monthToAddNumber){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(inputDate);
        // Add 'monthToAddNumber' months to inputDate
        calendar.add(Calendar.MONTH, monthToAddNumber);
        return calendar.getTime();
    }

然后调用方法：

addMonth(new Date(), 1)

 public Date addMonth(Date inputDate, int monthToAddNumber){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(inputDate);
        // Add 'monthToAddNumber' months to inputDate
        calendar.add(Calendar.MONTH, monthToAddNumber);
        return calendar.getTime();
    }

then call method:

addMonth(new Date(), 1)
回复 原文
携君以终年 2024-10-23 08:46:08

对于 Java 8 及更高版本，请使用 LocalDate 类的 plusMonths() 方法。

// 添加一个月到当前本地日期

LocalDate localDate = LocalDate.now().plusMonths(1);

// 添加一个月到任何本地日期对象

LocalDate localDate = LocalDate.parse("2022-02-14").plusMonths(1); // 2022-03-14

参考： https://www.javaexercise.com/java/java-add-months-to-date

Use the plusMonths() method of the LocalDate class for Java 8 and Higher Versions.

// Add one month to the current local date

LocalDate localDate = LocalDate.now().plusMonths(1);

// Add one month to any local date object

LocalDate localDate = LocalDate.parse("2022-02-14").plusMonths(1); // 2022-03-14

Reference: https://www.javaexercise.com/java/java-add-months-to-date

回复 原文
野侃 2024-10-23 08:46:08

你可以这样使用；

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String d = "2000-01-30";
Date date= new Date(sdf.parse(d).getTime());
date.setMonth(date.getMonth() + 1);

You can use like this;

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String d = "2000-01-30";
Date date= new Date(sdf.parse(d).getTime());
date.setMonth(date.getMonth() + 1);
回复 原文
十年不长 2024-10-23 08:46:08

为了找到一个月后的日子，有必要查看今天是该月的哪一天。

因此，如果这一天是该月的第一天，请运行以下代码，

Calendar calendar = Calendar.getInstance();

    Calendar calFebruary = Calendar.getInstance();
    calFebruary.set(Calendar.MONTH, Calendar.FEBRUARY);

    if (calendar.get(Calendar.DAY_OF_MONTH) == 1) {// if first day of month
    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
    Date nextMonthFirstDay = calendar.getTime();
    System.out.println(nextMonthFirstDay);

    }

如果该天是该月的最后一天，请运行以下代码。

    else if ((calendar.getActualMaximum(Calendar.DAY_OF_MONTH) == calendar.get(Calendar.DAY_OF_MONTH))) {// if last day of month
    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date nextMonthLastDay = calendar.getTime();
    System.out.println(nextMonthLastDay);
    }

如果这一天是二月，则运行以下代码，

    else if (calendar.get(Calendar.MONTH) == Calendar.JANUARY
            && calendar.get(Calendar.DAY_OF_MONTH) > calFebruary.getActualMaximum(Calendar.DAY_OF_MONTH)) {// control of february

    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date nextMonthLastDay = calendar.getTime();
    System.out.println(nextMonthLastDay);

    }

以下代码用于其他情况。

    else { // any day
    calendar.add(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date theNextDate = calendar.getTime();
    System.out.println(theNextDate);
    }

In order to find the day after one month, it is necessary to look at what day of the month it is today.

So if the day is first day of month run following code

Calendar calendar = Calendar.getInstance();

    Calendar calFebruary = Calendar.getInstance();
    calFebruary.set(Calendar.MONTH, Calendar.FEBRUARY);

    if (calendar.get(Calendar.DAY_OF_MONTH) == 1) {// if first day of month
    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
    Date nextMonthFirstDay = calendar.getTime();
    System.out.println(nextMonthFirstDay);

    }

if the day is last day of month, run following codes.

    else if ((calendar.getActualMaximum(Calendar.DAY_OF_MONTH) == calendar.get(Calendar.DAY_OF_MONTH))) {// if last day of month
    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date nextMonthLastDay = calendar.getTime();
    System.out.println(nextMonthLastDay);
    }

if the day is in february run following code

    else if (calendar.get(Calendar.MONTH) == Calendar.JANUARY
            && calendar.get(Calendar.DAY_OF_MONTH) > calFebruary.getActualMaximum(Calendar.DAY_OF_MONTH)) {// control of february

    calendar.add(Calendar.MONTH, 1);
    calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date nextMonthLastDay = calendar.getTime();
    System.out.println(nextMonthLastDay);

    }

the following codes are used for other cases.

    else { // any day
    calendar.add(Calendar.DATE, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
    Date theNextDate = calendar.getTime();
    System.out.println(theNextDate);
    }
回复 原文
煞人兵器 2024-10-23 08:46:08 
Date dateAfterOneMonth = new DateTime(System.currentTimeMillis()).plusMonths(1).toDate();

Date dateAfterOneMonth = new DateTime(System.currentTimeMillis()).plusMonths(1).toDate();
回复 原文
無處可尋 2024-10-23 08:46:08

常量是葡萄牙语，因为是，但 javadoc 是足够容易理解的。

只要打电话

Calendar cal = Calendar.getInstance();
cal.setTime(yourDate);
DateSumUtil.sumOneMonth(cal);

就可以了。相关代码：

package you.project.your_package_utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;

public class DateSumUtil {

    private static Integer[] meses31 = { 2, 4, 7, 9 };
    private static List<Integer> meses31List = Arrays.asList(meses31);
    private static SimpleDateFormat s = new SimpleDateFormat("dd/MM/yyyy");

    private static final int MES = Calendar.MONTH;
    private static final int ANO = Calendar.YEAR;
    private static final int DIA = Calendar.DAY_OF_MONTH;

    /**
     * Receives a date and adds one month. <br />
     * 
     * @param c date to receive an added month, as {@code java.util.Calendar}
     * @param dia day of month of the original month
     */
    public static void addOneMonth(Calendar c, int dia) throws ParseException {
    if (cal.get(MES) == 0) {            if (dia < 29)           cal.add(MES, 1);
        else {  if (cal.get(ANO) % 4 == 0) {    if (dia < 30)   cal.add(MES, 1);
                                                else            cal.setTime(s.parse("29/02/" + cal.get(ANO)));
                } else {                        if (dia < 29)   cal.add(MES, 1);
                                                else            cal.setTime(s.parse("28/02/" + cal.get(ANO)));
    }   }   } else if (meses31List.contains(cal.get(MES))) {
        if (dia < 31) {                                         cal.add(Calendar.MONTH, 1);
                                                                cal.set(DIA, dia);
        } else  cal.setTime(s.parse("30/" + (cal.get(MES) + 2) + "/" + cal.get(ANO)));
    } else {                                                    cal.add(MES, 1);
                                                                cal.set(DIA, dia);  }   
}

Constants are in Portuguese because yes, but javadoc is understandable enough.

Just call

Calendar cal = Calendar.getInstance();
cal.setTime(yourDate);
DateSumUtil.sumOneMonth(cal);

and that's that. Related code:

package you.project.your_package_utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.List;

public class DateSumUtil {

    private static Integer[] meses31 = { 2, 4, 7, 9 };
    private static List<Integer> meses31List = Arrays.asList(meses31);
    private static SimpleDateFormat s = new SimpleDateFormat("dd/MM/yyyy");

    private static final int MES = Calendar.MONTH;
    private static final int ANO = Calendar.YEAR;
    private static final int DIA = Calendar.DAY_OF_MONTH;

    /**
     * Receives a date and adds one month. <br />
     * 
     * @param c date to receive an added month, as {@code java.util.Calendar}
     * @param dia day of month of the original month
     */
    public static void addOneMonth(Calendar c, int dia) throws ParseException {
    if (cal.get(MES) == 0) {            if (dia < 29)           cal.add(MES, 1);
        else {  if (cal.get(ANO) % 4 == 0) {    if (dia < 30)   cal.add(MES, 1);
                                                else            cal.setTime(s.parse("29/02/" + cal.get(ANO)));
                } else {                        if (dia < 29)   cal.add(MES, 1);
                                                else            cal.setTime(s.parse("28/02/" + cal.get(ANO)));
    }   }   } else if (meses31List.contains(cal.get(MES))) {
        if (dia < 31) {                                         cal.add(Calendar.MONTH, 1);
                                                                cal.set(DIA, dia);
        } else  cal.setTime(s.parse("30/" + (cal.get(MES) + 2) + "/" + cal.get(ANO)));
    } else {                                                    cal.add(MES, 1);
                                                                cal.set(DIA, dia);  }   
}
回复 原文
美人骨 2024-10-23 08:46:08 
public class StringSplit {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        date(5, 3);
        date(5, 4);
    }

    public static String date(int month, int week) {
        LocalDate futureDate = LocalDate.now().plusMonths(month).plusWeeks(week);
        String Fudate = futureDate.toString();
        String[] arr = Fudate.split("-", 3);
        String a1 = arr[0];
        String a2 = arr[1];
        String a3 = arr[2];
        String date = a3 + "/" + a2 + "/" + a1;
        System.out.println(date);
        return date;
    }
}

输出：

10/03/2020
17/03/2020

public class StringSplit {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        date(5, 3);
        date(5, 4);
    }

    public static String date(int month, int week) {
        LocalDate futureDate = LocalDate.now().plusMonths(month).plusWeeks(week);
        String Fudate = futureDate.toString();
        String[] arr = Fudate.split("-", 3);
        String a1 = arr[0];
        String a2 = arr[1];
        String a3 = arr[2];
        String date = a3 + "/" + a2 + "/" + a1;
        System.out.println(date);
        return date;
    }
}

Output:

10/03/2020
17/03/2020
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