java日期减去天数得日期_Java日期添加天数，减去天数，日历

Myth丶恋晨 2023-02-28 06:29 5阅读 0赞

java日期减去天数得日期

Sometimes while working on Java Date, we need to add or subtract some days from it. Here I am providing java example to add days to java date or subtract days to java date object.

有时在处理Java Date时，我们需要从中添加或减去几天。 在这里，我提供了一个Java示例来向Java日期添加天数或向Java日期对象减去天数。

## Java日期添加天和减去天 **(**Java Date Add Days and Subtract Days**)** ##

Below is a simple program for Java Date add days and subtract days example.

下面是一个简单的Java Date加减天数示例程序。

package com.journaldev.util;
    
    import java.util.Calendar;
    import java.util.Date;
    import java.util.GregorianCalendar;
    
    public class JavaDateAddSubtract {
    
    	public static void main(String[] args) {
    		Date date = new Date();
    		System.out.println("Today's date: "+date.toString());
    		//test addDays method
    		int i=10;
    		while(i<=50){
    			Date newDate = addDays(date, i);
    			System.out.println("Java Date after adding "+i+" days: "+newDate.toString());
    			i+=10;
    		}
    		System.out.println("\n\n");
    		//test subtractDays method
    		i=10;
    		while(i<=50){
    			Date newDate = subtractDays(date, i);
    			System.out.println("Java Date after subtracting "+i+" days: "+newDate.toString());
    			i+=10;
    		}
    
    	}
    	/**
    	 * add days to date in java
    	 * @param date
    	 * @param days
    	 * @return
    	 */
    	public static Date addDays(Date date, int days) {
    		GregorianCalendar cal = new GregorianCalendar();
    		cal.setTime(date);
    		cal.add(Calendar.DATE, days);
    				
    		return cal.getTime();
    	}
    	
    	/**
    	 * subtract days to date in java
    	 * @param date
    	 * @param days
    	 * @return
    	 */
    	public static Date subtractDays(Date date, int days) {
    		GregorianCalendar cal = new GregorianCalendar();
    		cal.setTime(date);
    		cal.add(Calendar.DATE, -days);
    				
    		return cal.getTime();
    	}
    
    }

The output of the above program is:

上面程序的输出是：

Today's date: Thu Nov 15 11:45:05 PST 2012
    Java Date after adding 10 days: Sun Nov 25 11:45:05 PST 2012
    Java Date after adding 20 days: Wed Dec 05 11:45:05 PST 2012
    Java Date after adding 30 days: Sat Dec 15 11:45:05 PST 2012
    Java Date after adding 40 days: Tue Dec 25 11:45:05 PST 2012
    Java Date after adding 50 days: Fri Jan 04 11:45:05 PST 2013
    
    Java Date after subtracting 10 days: Mon Nov 05 11:45:05 PST 2012
    Java Date after subtracting 20 days: Fri Oct 26 11:45:05 PDT 2012
    Java Date after subtracting 30 days: Tue Oct 16 11:45:05 PDT 2012
    Java Date after subtracting 40 days: Sat Oct 06 11:45:05 PDT 2012
    Java Date after subtracting 50 days: Wed Sep 26 11:45:05 PDT 2012

You can use these utility functions to add days or subtract days to a Java Date object.

您可以使用这些实用程序功能向Java Date对象添加天数或减去天数。

**Update**: Java 8 has introduced Date and Time API that provides utility method to add and subtract days, weeks, months etc. from a given date. You should check it out at [Java Date API Tutorial][].

**更新** ：Java 8引入了日期和时间API，该API提供了从给定日期添加和减去天，周，月等的实用方法。 您应该在[Java Date API Tutorial中进行检查][Java Date API Tutorial] 。

> 翻译自: [https://www.journaldev.com/700/java-date-add-days-subtract-days-calendar][https_www.journaldev.com_700_java-date-add-days-subtract-days-calendar]

java日期减去天数得日期

[Java Date API Tutorial]: https://www.journaldev.com/2800/java-8-date-localdate-localdatetime-instant
[https_www.journaldev.com_700_java-date-add-days-subtract-days-calendar]: https://www.journaldev.com/700/java-date-add-days-subtract-days-calendar