JDK8 LocalDateTime和Date互换

系统管理员 2022-12-01 11:47 182阅读 0赞

转载自：[https://www.cnblogs.com/woshimrf/p/LocalDateTime-to-Date.html][https_www.cnblogs.com_woshimrf_p_LocalDateTime-to-Date.html]

## 叙述 ##

很想要用Java的时间api，但有时候还是需要转换为Date. 二者的相互转换并不是一步到位那么简单，所以，还是需要记录一下转换的api

### 解决方案 ###

**Date to LocalDateTime**

Date todayDate = new Date();
    
    LocalDateTime ldt = todayDate.toInstant()
            .atZone( ZoneId.systemDefault() )
            .toLocalDateTime();
    
    System.out.println(ldt);
    //2019-05-16T19:22:12.773

**LocalDateTime to Date**

LocalDateTime localDateTime = LocalDateTime.now();
    
    Date date = Date.from( localDateTime.atZone( ZoneId.systemDefault()).toInstant());
    
    System.out.println(date);
    //Thu May 16 19:22:37 CST 2019

**DateUtils**

import java.time.Instant;
    import java.time.LocalDate;
    import java.time.LocalDateTime;
    import java.time.ZoneId;
    import java.util.Date;
     
    public class DateUtils {
     
        public static Date asDate(LocalDate localDate) {
            return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
        }
     
        public static Date asDate(LocalDateTime localDateTime) {
            return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
        }
     
        public static LocalDate asLocalDate(Date date) {
            return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();
        }
     
        public static LocalDateTime asLocalDateTime(Date date) {
            return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();
        }
    }

[https_www.cnblogs.com_woshimrf_p_LocalDateTime-to-Date.html]: https://www.cnblogs.com/woshimrf/p/LocalDateTime-to-Date.html