Date与LocalDateTime和LocalDate互相转换思路
Date转LocalDateTime和LocalDate都可以通过Date先转换成Instant然后再转换成LocalDateTime和LocalDate，可以按照下图的方式进行转换。LocalDateTime和LocalDate转换成Date也是以Instant为中介来进行转换的。

1）Date转LocalDate的代码如下：

Date date = new Date();
System.out.println(date);
Instant instant = date.toInstant();
LocalDate ld = instant.atZone(ZoneId.systemDefault()).toLocalDate();
System.out.println(ld);

运行结果如下

Sat Jun 04 19:13:15 CST 2022
2022-06-04

2） Date转LocalDateTime，LocalDateTime提供了比LocalDate更直接的方法


Date转LocalDateTime转换代码如下：

Date date = new Date();
System.out.println(date);
//可以去查看可用的ZoneId集合，有500多个
Set<String> availableZoneIds = ZoneOffset.getAvailableZoneIds();
LocalDateTime ldt = LocalDateTime.ofInstant(date.toInstant(),ZoneOffset.UTC);
System.out.println(ldt);
LocalDateTime ldt1 = LocalDateTime.ofInstant(date.toInstant(),ZoneOffset.ofHours(5));
System.out.println(ldt1);

Sat Jun 04 19:40:04 CST 2022
2022-06-04T11:40:04.754
2022-06-04T16:40:04.754

3）LocalDate转Date

LocalDate now = LocalDate.now();
System.out.println(now);
Date date = Date.from(now.atStartOfDay(ZoneId.systemDefault()).toInstant());
System.out.println(date);

2022-06-04
Sat Jun 04 00:00:00 CST 2022

4）LocalDateTime转换成Date也是一样的

LocalDateTime now = LocalDateTime.now();
System.out.println(now);
Date date = Date.from(now.atZone(ZoneId.systemDefault()).toInstant());
System.out.println(date);

2022-06-04T19:41:17.715
Sat Jun 04 19:41:17 CST 2022

5）LocalDateTime转LocalDate

LocalDateTime now = LocalDateTime.now();
LocalDate date = now.toLocalDate();
System.out.println(date);

2022-06-04

6）LocalDate转LocalDateTime

LocalDate now = LocalDate.now();
LocalDateTime ldt = now.atStartOfDay();
System.out.println(ldt);

2022-06-04T00:00