18位时间戳改为Java时间，以及13位时间戳转换

    cn.hutool
    hutool-all
    5.7.16

引入架包

package com.timestamp.test;
 
import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
 
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.TimeZone;
 
@Slf4j
public class Test {
 
    public static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
 
    private static final long TICKS_AT_EPOCH_NT = 116444736000000000L;
 
    private static final long TICKS_PER_MILLISECOND = 10000;
 
    private static TimeZone TIME_ZONE = TimeZone.getDefault();
 
    private static final long TICKS_AT_EPOCH = 621355968000000000L;
 
    
    public static String fromNTTimeToJdate(String str) {
        String zero = "0";
        if (StrUtil.isEmpty(str)) {
            return null;
        } else if (zero.equals(str)) {
            return zero;
        } else {
            Calendar calendar = Calendar.getInstance(TIME_ZONE);
            calendar.setTimeInMillis((Long.parseLong(str) - TICKS_AT_EPOCH_NT) / TICKS_PER_MILLISECOND);
            calendar.setTimeInMillis(calendar.getTimeInMillis() - calendar.getTimeZone().getRawOffset());
            return (new SimpleDateFormat(DATE_FORMAT)).format(calendar.getTime());
        }
    }
 
    
    public static String fromDnetToJdate(String str) {
        String zero = "0";
        if (StrUtil.isEmpty(str)) {
            return null;
        } else if (zero.equals(str)) {
            return zero;
        } else {
            Calendar calendar = Calendar.getInstance(TIME_ZONE);
            calendar.setTimeInMillis((Long.parseLong(str)-TICKS_AT_EPOCH)/TICKS_PER_MILLISECOND);
            calendar.setTimeInMillis(calendar.getTimeInMillis()-calendar.getTimeZone().getRawOffset());
            return (new SimpleDateFormat(DATE_FORMAT)).format(calendar.getTime());
        }
    }
 
    public static void main(String[] args) {
        String ntStr = "131974608035554296";
        log.info("NT时间戳：" + fromNTTimeToJdate(ntStr));
        String dntStr = "635210495600000000";
        log.info(".net18位时间戳转换：" + fromDnetToJdate(dntStr));
    }
 
}

13位时间戳

String s="1565499360620";
        Long timeStamp = Long.valueOf(s);  //获取当前时间戳
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String sd = sdf.format(new Date(Long.parseLong(String.valueOf(timeStamp))));      // 时间戳转换成时间
        System.out.println("格式化结果：" + sd);

        SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy 年 MM 月 dd 日 HH 时 mm 分 ss 秒");
        String sd2 = sdf2.format(new Date(Long.parseLong(String.valueOf(timeStamp))));
        System.out.println("格式化结果：" + sd2);

原文链接：https://blog.csdn.net/qq_37552993/article/details/88683056