计算Java 8中两个日期之间的天数

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计算Java 8中两个日期之间的天数

手机用户2602915451 发布于 2022-12-10 17:39

我知道有很多关于如何获得的问题,但我想要和使用新的Java 8 Date api的例子.我也知道JodaTime库,但我想要一种没有外部库的工作方式.

功能需要抱怨这些限制:

防止日期保存时间错误

输入是两个Date的对象(没有时间,我知道localdatetime,但我需要处理日期实例)

syntagma.. 383

如果您想要逻辑日历日,请使用以下DAYS.between()方法java.time.temporal.ChronoUnit:

LocalDate dateBefore;
LocalDate dateAfter;
long daysBetween = DAYS.between(dateBefore, dateAfter);

如果你想要24小时的文字,(持续时间),你可以使用Duration该类:

LocalDate today = LocalDate.now()
LocalDate yesterday = today.minusDays(1);
// Duration oneDay = Duration.between(today, yesterday); // throws an exception
Duration.between(today.atStartOfDay(), yesterday.atStartOfDay()).toDays() // another option

有关更多信息,请参阅此文档(以及其他文档:Oracle的Java 8).

7 个回答

你可以使用until():

LocalDate independenceDay = LocalDate.of(2014, Month.JULY, 4);
LocalDate christmas = LocalDate.of(2014, Month.DECEMBER, 25);

System.out.println("Until christmas: " + independenceDay.until(christmas));
System.out.println("Until christmas (with crono): " + independenceDay.until(christmas, ChronoUnit.DAYS));

2022-12-11 02:05 回答

CK92_474

如果您想要逻辑日历日,请使用以下DAYS.between()方法java.time.temporal.ChronoUnit:

LocalDate dateBefore;
LocalDate dateAfter;
long daysBetween = DAYS.between(dateBefore, dateAfter);

如果你想要24小时的文字,(持续时间),你可以使用Duration该类:

LocalDate today = LocalDate.now()
LocalDate yesterday = today.minusDays(1);
// Duration oneDay = Duration.between(today, yesterday); // throws an exception
Duration.between(today.atStartOfDay(), yesterday.atStartOfDay()).toDays() // another option

有关更多信息,请参阅此文档(以及其他文档:Oracle的Java 8).

2022-12-11 02:07 回答

缅甸钻石国际开户集团

根据VGR的评论,您可以使用以下内容:
```
ChronoUnit.DAYS.between(firstDate, secondDate)
```
2022-12-11 02:08 回答

念中怡名哲盈_452
每个人都说要使用ChronoUnit.DAYS.between,但只是委托给你自己称之为另一种方法.所以你也可以这样做firstDate.until(secondDate, ChronoUnit.DAYS).

两者的文档实际上都提到了这两种方法,并说使用哪一种更具可读性.

2022-12-11 02:09 回答

o.o

如果starDate和endDate是java.util.Date的实例

我们可以在ChronoUnit 枚举中使用下面的between（）方法

public long between(Temporal temporal1Inclusive, Temporal temporal2Exclusive) { //.. }

ChronoUnit.DAYS计算完成24小时的天数。

import java.time.temporal.ChronoUnit; ChronoUnit.DAYS.between(startDate.toInstant(), endDate.toInstant()); //OR ChronoUnit.DAYS.between(Instant.ofEpochMilli(startDate.getTime()), Instant.ofEpochMilli(endDate.getTime()));

2022-12-11 02:13 回答

mobiledu2502929297

您可以使用DAYS.between从java.time.temporal.ChronoUnit

例如

import java.time.temporal.ChronoUnit; public long getDaysCountBetweenDates(LocalDate dateBefore, LocalDate dateAfter) { return DAYS.between(dateBefore, dateAfter); }

2022-12-11 03:13 回答

-啊-亮---_252_980

在枚举java.time.temporal.ChronoUnit中使用DAYS .以下是示例代码:

输出: *开始日期:2015-03-01和结束日期之间的天数:2016-03-03是==> 368.**开始日期:2016-03-03和结束日期之间的天数: 2015-03-01是==> -368*

package com.bitiknow.date; import java.time.LocalDate; import java.time.temporal.ChronoUnit; /** * * @author pradeep * */ public class LocalDateTimeTry { public static void main(String[] args) { // Date in String format. String dateString = "2015-03-01"; // Converting date to Java8 Local date LocalDate startDate = LocalDate.parse(dateString); LocalDate endtDate = LocalDate.now(); // Range = End date - Start date Long range = ChronoUnit.DAYS.between(startDate, endtDate); System.out.println("Number of days between the start date : " + dateString + " and end date : " + endtDate + " is ==> " + range); range = ChronoUnit.DAYS.between(endtDate, startDate); System.out.println("Number of days between the start date : " + endtDate + " and end date : " + dateString + " is ==> " + range); } }

2022-12-11 03:13 回答

圣菁振婷玉勇

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