根据函数System.currentTimeMillis()返回的毫秒数得到日期

青旅半醒 2023-01-08 02:30 99阅读 0赞

//计算自1970年1月1日 ，根据函数System.currentTimeMillis()返回的毫秒数得到日期
    class ch0533 {
    public static void main(String[] args) {
        long ms=System.currentTimeMillis();
        System.out.println(formatTime(ms));
    
        }
    public static String formatTime(long ms) {
             int month_days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};  
             int month_days_leap[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};  //闰年的月数
                 int h1=1000*60*60*8;//东八区所以要加八个小时
             ms+=h1;
             int ss = 1000;
                 int mi = ss * 60;
                 int hh = mi * 60;
                 int dd = hh * 24;
             int mm=1;//一月
             int yy=1970;
             long day = ms / dd;
             long d2=ms/dd;
             d2++;//一号开始算
                 for(;;)
             {
            if(isleapyear(yy))
            {   if(d2<366)
                break;
                else {yy++;
                    d2-=366;}
            }
            else   {
                if(d2<365)
                    break;
                else {yy++;
                    d2-=365;}
                }
            }
             for(int i=0;i<12;i++)
             {
            if(isleapyear(yy))
                {   if(d2<month_days_leap[i])
                    {mm=i+1;break;}
                else
                    d2-=month_days_leap[i];}
            else        
            {   if(d2<month_days[i])
                    {mm=i+1;break;}
                else
                    d2-=month_days[i];}
            }
    
                 long hour = (ms - day * dd) / hh;
                 long minute = (ms - day * dd - hour * hh) / mi;
                 long second = (ms - day * dd - hour * hh - minute * mi) / ss;
                 long milliSecond = ms - day * dd - hour * hh - minute * mi - second * ss;
                 String strHour = hour < 10 ? "0" + hour : "" + hour;
                 String strMinute = minute < 10 ? "0" + minute : "" + minute;
                 String strSecond = second < 10 ? "0" + second : "" + second;
                 String strMilliSecond = milliSecond < 10 ? "0" + milliSecond : "" + milliSecond;//毫秒
                 strMilliSecond = milliSecond < 100 ? "0" + strMilliSecond : "" + strMilliSecond;
    
                 return yy+"年"+mm+"月"+d2+"日"+strHour + " 小时 "+strMinute + " 分钟 " + strSecond + " 秒";}
    
    
    
    
    
    
    public static boolean isleapyear(int yy)  
    {  
        if( (yy % 4 == 0 && yy % 100 != 0) || yy % 400 == 0)  
            return true;  
        else  
            return false;  
    }  
    }