如何在今天午夜和明天午夜创建一个Java Date对象？

编程入门行业动态更新时间:2024-10-28 15:24:24

本文介绍了如何在今天午夜和明天午夜创建一个Java Date对象？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

在我的代码中，我需要找到我今天发生的一切事情。所以我需要从今天上午00:00（今天凌晨凌晨）到晚上12点（今晚午夜）的日期进行比较。

In my code I need to find all my things that happened today. So I need to compare against dates from today at 00:00am (midnight early this morning) to 12:00pm (midnight tonight).

我知道...

I know ...

Date today = new Date();

...现在得到我和...

... gets me right now. And ...

Date beginning = new Date(0);

...在1970年1月1日获得零时间。但是什么是简单的方法来获得零时间今天和零时间明天？

... gets me zero time on Jan 1, 1970. But what's an easy way to get zero time today and zero time tomorrow?

任何帮助是非常感谢！

更新;我这样做，但肯定有一个更简单的方法？

UPDATE; I did this, but surely there's an easier way??

Calendar calStart = new GregorianCalendar(); calStart.setTime(new Date()); calStart.set(Calendar.HOUR_OF_DAY, 0); calStart.set(Calendar.MINUTE, 0); calStart.set(Calendar.SECOND, 0); calStart.set(Calendar.MILLISECOND, 0); Date midnightYesterday = calStart.getTime(); Calendar calEnd = new GregorianCalendar(); calEnd.setTime(new Date()); calEnd.set(Calendar.DAY_OF_YEAR, calEnd.get(Calendar.DAY_OF_YEAR)+1); calEnd.set(Calendar.HOUR_OF_DAY, 0); calEnd.set(Calendar.MINUTE, 0); calEnd.set(Calendar.SECOND, 0); calEnd.set(Calendar.MILLISECOND, 0); Date midnightTonight = calEnd.getTime();

推荐答案

java.util.Calendar

// today Calendar date = new GregorianCalendar(); // reset hour, minutes, seconds and millis date.set(Calendar.HOUR_OF_DAY, 0); date.set(Calendar.MINUTE, 0); date.set(Calendar.SECOND, 0); date.set(Calendar.MILLISECOND, 0); // next day date.add(Calendar.DAY_OF_MONTH, 1);

JDK 8 - java.time.LocalTime和java .time.LocalDate

JDK 8 - java.time.LocalTime and java.time.LocalDate

LocalTime midnight = LocalTime.MIDNIGHT; LocalDate today = LocalDate.now(ZoneId.of("Europe/Berlin")); LocalDateTime todayMidnight = LocalDateTime.of(today, midnight); LocalDateTime tomorrowMidnight = todayMidnight.plusDays(1);

Joda-Time

如果您使用JDK< 8，我推荐 Joda时间，因为API真的很棒：

Joda-Time

If you're using a JDK < 8, I recommend Joda Time, because the API is really nice:

DateTime date = new DateTime().toDateMidnight().toDateTime(); DateTime tomorrow = date.plusDays(1);

2.3的Joda时间 DateMidnight is deprecated ，所以使用这个：

Since version 2.3 of Joda Time DateMidnight is deprecated, so use this:

DateTime today = new DateTime().withTimeAtStartOfDay(); DateTime tomorrow = today.plusDays(1).withTimeAtStartOfDay();

如果您不想要JVM的当前默认时区，请传递时区。

Pass a time zone if you don't want the JVM’s current default time zone.

DateTimeZone timeZone = DateTimeZone.forID("America/Montreal"); DateTime today = new DateTime(timeZone).withTimeAtStartOfDay(); // Pass time zone to constructor.