java linux时间戳

public class TimestampExample {
    public static void main(String[] args) {
        // 获取当前时间戳（毫秒级）
        long currentTimeMillis = System.currentTimeMillis();
        System.out.println("Current timestamp in milliseconds: " + currentTimeMillis);

        // 将时间戳转换为日期
        java.util.Date date = new java.util.Date(currentTimeMillis);
        System.out.println("Date from timestamp: " + date);

        // 计算两个时间戳之间的时间差
        long pastTimestamp = 1633024800000L; // 示例过去的时间戳
        long timeDifference = currentTimeMillis - pastTimestamp;
        System.out.println("Time difference in milliseconds: " + timeDifference);
    }
}

import java.text.SimpleDateFormat;
import java.util.Date;

public class TimestampToStringExample {
    public static void main(String[] args) {
        long timestamp = System.currentTimeMillis();
        Date date = new Date(timestamp);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String formattedDate = sdf.format(date);
        System.out.println("Formatted date: " + formattedDate);
    }
}