Java 8 – Convert Instant to LocalDateTime

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最新推荐文章于 2024-04-04 18:43:55 发布

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文章标签： java

本文详细介绍如何在Java8中将Instant类型转换为LocalDateTime类型，以及相反的转换过程。通过两个实例，展示了使用ZoneOffset进行时间区域调整的方法。

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Java 8 examples to show you how to convert from Instant to LocalDateTime

1. Instant -> LocalDateTime

The java.time.LocalDateTime has no concept of time zone, just provide a zero offset UTC+0.

InstantExample1.java

package com.mkyong.date;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;

public class InstantExample1 {

    public static void main(String[] argv) {

		// Parse a ISO 8601 Date directly
		//Instant instant = Instant.parse("2016-08-18T06:17:10.225Z");

        Instant instant = Instant.now();

        System.out.println("Instant : " + instant);

        //Convert instant to LocalDateTime, no timezone, add a zero offset / UTC+0
        LocalDateTime ldt = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);

        System.out.println("LocalDateTime : " + ldt);

    }

}

Output

Instant : 2016-08-18T06:17:10.225Z
LocalDateTime : 2016-08-18T06:17:10.225

2. LocalDateTime -> Instant

InstantExample2.java

package com.mkyong.date;

import java.time.*;

public class InstantExample2 {

    public static void main(String[] argv) {

		// Hard code a date time
        LocalDateTime dateTime = LocalDateTime.of(2016, Month.AUGUST, 18, 6, 17, 10);

        System.out.println("LocalDateTime : " + dateTime);

        // Convert LocalDateTime to Instant, UTC+0
        Instant instant = dateTime.toInstant(ZoneOffset.UTC);

        System.out.println("Instant : " + instant);

    }

}

Instant : 2016-08-18T06:17:10.225Z
LocalDateTime : 2016-08-18T06:17:10.225

http://www.mkyong.com/java8/java-convert-instant-to-localdatetime/
http://www.mkyong.com/tutorials/java-date-time-tutorials/