如何将Date转换为LocalTime？ [英] How to convert Date to LocalTime?

问题描述

我正在尝试将日期转换为 LocalTime （我只想要几分钟日期），但它没有解决。我第一次在这里查看 date-to-java-time ，并尝试转换一个日期到 LocalTime 但是没有工作，所以我试图转换 Date 到日历然后将日历转换为日期但也没有起作用。

I'm trying to convert a Date to a LocalTime (I only want the hours and minutes of the date) but it's not working out. I first looked here date-to-java-time and try to convert a Date to LocalTime but that didn't work so I tried to convert Date to Calendar and then convert Calendar to Date but that also didn't work.

我认为这是因为 date 将时间存入 fasttime 而不是 cdate 。但这只是一种直觉。这是我的代码：

I think it is because date stores the time in fasttime instead of cdate. But that's just a gut feeling. Here's my code:

//create the date
String strTime ="2011-02-18 05:00:00.0";
Date date = format.parse(strTime);    

//convert to calendar
Calendar cal = Calendar.getInstance();
cal.setTime(date);

//convert the date to a local time
Instant instant = Instant.ofEpochMilli(cal.getTimeInMillis());
LocalTime convert = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalTime();

我没有收到编译错误，但是$ LocalTime 他的小时没有设置并保持 0 。

I don't get a compile error but the LocalTime his hours aren't set and stay 0.

推荐答案

您的输入实际上是一个 LocalDateTime 。简单地将它解析成一个 LocalDateTime ，然后从中获取 LocalTime 将会简单得多。没有时区担心，没有一点遗留的课程（避免日期和日历可能的话））

Your input is effectively a LocalDateTime. It would be much simpler to simply parse that to a LocalDateTime and then get the LocalTime from that. No time zones to worry about, no somewhat-legacy classes (avoid Date and Calendar where possible...)

import java.time.*;
import java.time.format.*;
import java.util.*;

public class Test {

    public static void main(String[] args) {
        DateTimeFormatter formatter =
            DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S", Locale.US);

        String text = "2011-02-18 05:00:00.0";
        LocalDateTime localDateTime = LocalDateTime.parse(text, formatter);
        LocalTime localTime = localDateTime.toLocalTime();
        System.out.println(localTime);
    }
}

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