计算 Java 8 中两个日期之间的天数 [英] Calculate days between two Dates in Java 8

问题描述

我知道有很多关于如何在 Java 中获取 Date 的问题，但我想要一个使用新 Java 8 Date API 的示例.我也知道 JodaTime 库，但我想要一种不依赖外部库的方法.

I know there are lots of questions on SO about how to get Dates in Java, but I want an example using new Java 8 Date API. I also know about the JodaTime library, but I want a method without relying on external libraries.

该功能需要符合这些限制:

The function needs to be compliant with these restrictions:

1. 防止日期保存时间出错
2. 输入是两个 Date 对象(没有时间，我知道 LocalDateTime，但我需要用 Date 实例来做到这一点)

1. Prevent errors from date savetime
2. Inputs are two Date objects (without time, I know about LocalDateTime, but I need to do this with Date instances)

推荐答案

如果您想要逻辑日历天，请使用 DAYS.between() 方法来自 java.time.temporal.ChronoUnit:

If you want logical calendar days, use DAYS.between() method from java.time.temporal.ChronoUnit:

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

如果您想要字面的 24 小时天，(持续时间)，您可以使用 Duration 类:

If you want literal 24 hour days, (a duration), you can use the Duration class instead:

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

有关详细信息，请参阅本文档.

For more information, refer to this document.

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