如何在Java 8中使用LocalDateTime计算两个日期之间的时差？ [英] How to calculate time difference between two dates using LocalDateTime in Java 8?

问题描述

给出了许多答案，但是我找不到与我的情况相符的答案。我还需要找到8小时的时间差异以及日期变更。就像如果时间大于8小时，则不要执行任何操作。

There are numerous answers given but I am unable to find compatible with my situation. I need to find difference of 8 hours in time as well as on date change too. Like if time is greater then 8 hours then do not execute something .

我们有任何方法可以在 LocalDateTime 在Java-8中？

Do we have any method which achieve the same in LocalDateTime in Java-8?

我尝试使用以下方法，但无法实现相同效果。

I have tried to use following but unable to achieve the same.

LocalDateTime fromDateTime = LocalDateTime.of(2017, 07, 07, 07, 00, 55);
LocalDateTime toDateTime = LocalDateTime.now();
LocalDateTime tempDateTime = LocalDateTime.from(fromDateTime);

long years = tempDateTime.until(toDateTime, ChronoUnit.YEARS);
tempDateTime = tempDateTime.plusYears(years);

long months = tempDateTime.until(toDateTime, ChronoUnit.MONTHS);
tempDateTime = tempDateTime.plusMonths(months);

long days = tempDateTime.until(toDateTime, ChronoUnit.DAYS);
tempDateTime = tempDateTime.plusDays(days);

long hours = tempDateTime.until(toDateTime, ChronoUnit.HOURS);
tempDateTime = tempDateTime.plusHours(hours);

long minutes = tempDateTime.until(toDateTime, ChronoUnit.MINUTES);
tempDateTime = tempDateTime.plusMinutes(minutes);

long seconds = tempDateTime.until(toDateTime, ChronoUnit.SECONDS);

System.out.println("" + java.time.Duration.between(tempDateTime, toDateTime).toHours());

System.out.println(years + " years "
        + months + " months "
        + days + " days "
        + hours + " hours "
        + minutes + " minutes "
        + seconds + " seconds.");

很难分别检查时间和日期。

It is difficult to check on time and date separately.

最初我用类似的方式编码，但它看起来不正确：

Initially I coded it like but it does not looks correct:

return openBrat!=null 
        && openBrat.until(LocalDateTime.now(), ChronoUnit.DAYS) == 0 &&  
          openBrat.until(LocalDateTime.now(), ChronoUnit.HOURS) >= 8
         && openBrat.until(LocalDateTime.now(), ChronoUnit.Minutes) >= 0;

有人可以建议如何减去：

Could anyone please suggest how to subtract like:

2017 07 06 23:30:00 - 2017 07 07 01:30:00 - Should return 2 hours.

推荐答案

以下显示 2 ，就像您期望的那样。

The following prints 2, just like you'd expect.

LocalDateTime ldt1 = LocalDateTime.of(2017, 07, 06, 23, 30, 00);
LocalDateTime ldt2 = LocalDateTime.of(2017, 07, 07, 1, 30, 00);
System.out.println(Duration.between(ldt1, ldt2).toHours());

您的代码没有错。如果您没有得到期望的结果，则可能需要检查您的期望是否正确。

There is nothing wrong with your code. If you don't get the outcome you expect, you may need to check if your expectation is correct.

要做当差异少于8小时时，您可以执行以下操作：

To do something when the difference is less than 8 hours, you can do something like this:

LocalDateTime ldt1 = LocalDateTime.of(2017, 07, 06, 23, 30, 00);
LocalDateTime ldt2 = LocalDateTime.of(2017, 07, 07, 1, 30, 00);
Duration d1 = Duration.between(ldt1, ldt2);
Duration d2 = Duration.ofHours(8);

if (d1.compareTo(d2) > 0) {
    System.out.println("do nothing");
} else {
    System.out.println("do something");
}

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