Java 时间戳转换为yyyy-MM-dd格式

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

public class TimestampConverter {
    public static void main(String[] args) {
        long timestamp = 1612345678901L;
        Date date = new Date(timestamp);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String formattedDateTime = sdf.format(date);
        System.out.println(formattedDateTime);
    }
}