Android计算两个日期之间的天数 [英] Android calculate days between two dates

问题描述

我编写了以下代码来查找两个日期之间的日期

I have written the following code to find days between two dates

    startDateValue = new Date(startDate);
    endDateValue = new Date(endDate);
    long diff = endDateValue.getTime() - startDateValue.getTime();
    long seconds = diff / 1000;
    long minutes = seconds / 60;
    long hours = minutes / 60;
    long days = (hours / 24) + 1;
    Log.d("days", "" + days);

当开始日期和结束日期分别为2/3/2017和3/3/2017时，显示的天数为29.尽管它们是同一天，却显示1.请假.因此，如果要请一天假，他必须选择相同的开始日期和结束日期.因此，在这种情况下，他请了两天假.

When start and end date are 2/3/2017 and 3/3/2017 respectively the number of days showing is 29.Though when they are of the same day it is showing 1.(The number of days one takes a leave.So if one takes a single day leave,he has to select same start and end date.So in this case he has taken two days leave).

我做错了什么? 谢谢您的时间.

What am I doing wrong? Thank you for your time.

注意:请不要使用日期构造函数.检查下面接受的答案.使用simpledateformat或Joda时间.日期构造函数已弃用.

Note: Please don't use the date constructor. Check the accepted answer below. Use simpledateformat or Joda time. Date constructor is deprecated.

推荐答案

用于生成日期对象的代码:

Your code for generating date object:

Date date = new Date("2/3/2017"); //deprecated

您将得到28天的答案，因为根据Date(String)构造函数，它认为日期= 3，month = 2，年份= 2017

You are getting 28 days as answer because according to Date(String) constructor it is thinking day = 3,month = 2 and year = 2017

您可以按以下方式将String转换为Date:

You can convert String to Date as follows:

String dateStr = "2/3/2017";
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date date = sdf.parse(dateStr);

使用上面的模板制作Date对象.然后使用下面的代码计算两个日期之间的天数.希望这件事能解决.

Use above template to make your Date object. Then use below code for calculating days in between two dates. Hope this clear the thing.

可以完成以下操作:

long diff = endDateValue.getTime() - startDateValue.getTime();
System.out.println ("Days: " + TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS));

请检查链接

如果您使用Joda Time，它将更加简单:

If you use Joda Time it is much more simple:

int days = Days.daysBetween(date1, date2).getDays();

请检查 JodaTime

如何在Java Project中使用JodaTime

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