常用类11/lnstant类的使用(JDK8中新日期时间API)

野性酷女 2023-10-04 16:46 21阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70 1]  
需要了解世界时间的标准  
![在这里插入图片描述][0db72be32b2440068ffba9e2d37abbd2.png]  
类似于java.utiL.Date类

> lnstant类的使用

package com.cyl.Date;
    
    import org.junit.Test;
    
    import java.time.Instant;
    import java.time.OffsetDateTime;
    import java.time.ZoneOffset;
    
    public class JDK8DateTimeTest {
        
        //LocalDate,LocalTime,LocalDateTime 的使用
        @Test
        public void test2(){
        
            //now():获取本初子午线对应的标准时间
            Instant instant = Instant.now();
            System.out.println(instant);//本初子午线
    
            //添加时间偏移量
            //东8区，需要加8小时（东加西减）
            OffsetDateTime offsetDateTime = instant.atOffset(ZoneOffset.ofHours(8));
            System.out.println(offsetDateTime);//正确时间
    
            //toEpochMilli()：获取自1970年1月1日0时0分0秒(UTC）开始的毫秒数-->Date类的getTime()
            long milli = instant.toEpochMilli();
            System.out.println(milli);
    
            //ofEpochMilli():通过给定的毫秒数，获取Instant实例-->Date(long millis)
            Instant instant1 = Instant.ofEpochMilli(1628661227788L);
            System.out.println(instant1);
    
        }
    }

> 结果：  
> ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70 2]

> 时间参考：  
> ![在这里插入图片描述][cb1577fc092840579519656650e84114.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/b625d8e7002240d08c3080dd641a0ae7.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/b9397901f44e4ac09b45e58ba82caff7.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA==,size_16,color_FFFFFF,t_70
[0db72be32b2440068ffba9e2d37abbd2.png]: https://img-blog.csdnimg.cn/0db72be32b2440068ffba9e2d37abbd2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/b3c4c7023d2c426f8bf62a0203e785db.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80ODA2MzY2MA==,size_16,color_FFFFFF,t_70
[cb1577fc092840579519656650e84114.png]: https://img-blog.csdnimg.cn/cb1577fc092840579519656650e84114.png