减去日期并得到差异的日期。如何减去他们？ [英] Subtracting dates and get difference in days.How to subtract them?

问题描述

任何人都可以告诉如何从今天中减去字符串after，以获得日期差异。

  import java.text 。*; 
 import java.util。*; 
 
 
 public class Main {
 public static void main（String args []）{
 
 
 SimpleDateFormat sdf = new SimpleDateFormat（ yyyy / MM / dd）; 
日历cal = Calendar.getInstance（）; 
 String today = sdf.format（cal.getTime（））; 
 System.out.println（今天）; 
 cal.add（Calendar.DATE，20）; 
 String After = sdf.format（cal.getTime（））; 
 System.out.println（之后）; 
 
} 
} 
  

解决方案

$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ code> Date today = LocalDate.now（）;
Date futureDate = LocalDate.now（）。plusDays（1）;
long days = Period.between（today，futureDate）.getDays（）;

期间 & LocalDate 类可用于＃java8

LocalDate docs

LocalDate是一个不可变的日期时间对象，表示一个日期，
通常被视为年月日。也可以访问其他日期字段，例如
每天的日期，星期几和星期。对于
示例，值2007年10月2日可以存储在LocalDate中。

---

如果您不使用java8，请使用joda-time库的 org.joda.time.Days 实用程序来计算此

  Days day = Days.daysBetween（startDate，endDate）; 
 int days = d.getDays（）; 
  

can anyone tell how to subtract string "after" from "today" to get days difference.

import java.text.*;
import java.util.*;


public class Main {
public static void main(String args[]){


SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd");
Calendar cal=Calendar.getInstance();
String today=sdf.format(cal.getTime());
System.out.println(today);
cal.add(Calendar.DATE, 20);
String After=sdf.format(cal.getTime());
System.out.println(After);

}
}

解决方案

It would be easier with java8 where you dont need to subtract long values represent of date and change back to days, hours and minutes.

Date today= LocalDate.now();
Date futureDate = LocalDate.now().plusDays(1);
long days = Period.between(today, futureDate).getDays();

Period & LocalDate class are available in #java8

LocalDate docs

LocalDate is an immutable date-time object that represents a date, often viewed as year-month-day. Other date fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. For example, the value "2nd October 2007" can be stored in a LocalDate.

---

If you are not using java8, use joda-time library's org.joda.time.Days utility to calculate this

Days day = Days.daysBetween(startDate, endDate);
int days = d.getDays();

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