Java

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

public class Ms2DateTime {
    /**
     * 时间戳（毫秒）转DateTime
     */
    public static void main(String[] args) {
        // 当前系统时间戳
        Long ms = System.currentTimeMillis();
        System.out.println(ms);
        // 毫秒转DateTime
        LocalDateTime lDT = LocalDateTime.ofInstant(Instant.ofEpochMilli(ms), ZoneId.of("Asia/Shanghai"));
        System.out.println(lDT);
        // DateTime转字符串
        String t = lDT.format(DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss"));
        System.out.println(t);
        // 获取小时
        Integer h = lDT.getHour();
        System.out.println(h);
    }
}

某次打印结果

1650082130307
2022-04-16T12:08:50.307
2022-04-16 12:08:50
12

Scala

import java.time.Instant
import java.time.LocalDateTime
import java.time.ZoneId
import java.time.format.DateTimeFormatter

// 当前毫秒
val ms: Long = System.currentTimeMillis
println(ms)
// 毫秒转DateTime
val lDT: LocalDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(ms), ZoneId.of("Asia/Shanghai"))
println(lDT)
// DateTime转字符串
val t: String = lDT.format(DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss"))
println(t)
// 获取小时
val h: Integer = lDT.getHour
println(h)

某次打印结果

1650082279606
2022-04-16T12:11:19.606
2022-04-16 12:11:19
12

时间戳起点

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

public class Ms2DateTime {
    public static void main(String[] args) {
        // 毫秒转DateTime
        LocalDateTime lDT = LocalDateTime.ofInstant(Instant.ofEpochMilli(0L), ZoneId.of("Asia/Shanghai"));
        System.out.println(lDT);
        // DateTime转字符串
        String t = lDT.format(DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss"));
        System.out.println(t);
    }
}

打印结果

1970-01-01T08:00
1970-01-01 08:00:00

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