JAVA中时间戳与LocalDateTime互相转换代码例子

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;

public class TimestampToLocalDateTime {
    public static void main(String[] args) {
    	// 注意：这里是秒级时间戳
        long timestamp = 1692948472; 

        // 使用Instant从时间戳创建时间点
        Instant instant = Instant.ofEpochSecond(timestamp);

        // 使用ZoneId定义时区（可以根据需要选择不同的时区）
        ZoneId zoneId = ZoneId.of("Asia/Shanghai");

        // 将Instant转换为LocalDateTime
        LocalDateTime localDateTime = instant.atZone(zoneId).toLocalDateTime();

        System.out.println("时间戳: " + timestamp);
        System.out.println("转换后的LocalDateTime: " + localDateTime);
    }
}

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;

public class LocalDateTimeToTimestamp {
    public static void main(String[] args) {
        // 创建一个LocalDateTime对象
        LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 25, 0, 0);

        // 使用ZoneId定义时区（可以根据需要选择不同的时区）
        ZoneId zoneId = ZoneId.of("Asia/Shanghai");

        // 将LocalDateTime转换为Instant
        Instant instant = localDateTime.atZone(zoneId).toInstant();

        // 获取时间戳
        long timestamp = instant.getEpochSecond();

        System.out.println("LocalDateTime: " + localDateTime);
        System.out.println("转换后的时间戳: " + timestamp);
    }
}

LocalDateTime localDateTime = LocalDateTime.ofEpochSecond(System.currentTimeMillis()/1000, 0, ZoneOffset.ofHours(8));

LocalDate parse = LocalDate.parse(“2020-05-13”);

LocalDate localDate = LocalDateTime.now().toLocalDate();

Date date = new Date();
LocalDate localDate = date.toInstant().atZone(ZoneOffset.ofHours(8)).toLocalDate();

LocalDate localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();

Date date = new Date(System.currentTimeMillis());

date.setTime(System.currentTimeMillis());

LocalDateTime localDateTime = LocalDateTime.ofInstant(new Date().toInstant(), ZoneId.systemDefault());

Date date1 = Date.from(LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant());

ZonedDateTime zonedDateTime = LocalDate.now().atStartOfDay(ZoneId.systemDefault());
Date date = Date.from(zonedDateTime.toInstant());