如何获取两个日历实例之间的天数? [英] How to get number of days between two calendar instance?

问题描述

如果有日期变化，我想找出两个 Calendar 对象之间的天数差异，例如如果时钟从 23:59-0:00 滴答作响，则应该有天数差异.

I want to find the difference between two Calendar objects in number of days if there is date change like If clock ticked from 23:59-0:00 there should be a day difference.

这是我写的

public static int daysBetween(Calendar startDate, Calendar endDate) {  
    return Math.abs(startDate.get(Calendar.DAY_OF_MONTH)-endDate.get(Calendar.DAY_OF_MONTH));  
} 

但它不起作用，因为如果有月份差异，它只会在天之间产生差异，它毫无价值.

but its not working as it only gives difference between days if there is month difference its worthless.

推荐答案

在 Java 8 及更高版本中，我们可以简单地使用 java.time 类.

In Java 8 and later, we could simply use the java.time classes.

hoursBetween = ChronoUnit.HOURS.between(calendarObj.toInstant(), calendarObj.toInstant());

daysBetween = ChronoUnit.DAYS.between(calendarObj.toInstant(), calendarObj.toInstant());

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