如何在Dart获得最后一个午夜？

问题描述

我想这在大多数语言中都是很常见的任务，但是我不清楚如何在Flutter应用程序中完成此任务。如何在Dart中检索最后一个午夜的DateTime对象？还是可能，今天/明天/昨天的任何特定时间？

I guess this is pretty common task in most languages, however it was not clear to me how to get this done in my Flutter app. How to retrieve DateTime object of the last midnight in Dart? Or potentially, any particular time today / tomorrow / yesterday?

推荐答案

这应该做同样的事情

final now = DateTime.now();
final lastMidnight = new DateTime(now.year, now.month, now.day);

您可以使用这种方式获取当天的不同时间

You can use this way to get different times of this day

final tomorrowNoon = new DateTime(now.year, now.month, now.day + 1, 12);

final yesterdaySixThirty = new DateTime(now.year, now.month, now.day - 1, 6, 30);

根据需要，绝对值会更安全，因为加/减由于leap年和夏令时，持续时间可能会导致意外。

Depending on what you want can absolute values be more safe because adding/subtracting Duration can result in surprises because of leap years and daylight saving time.

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