大体算法如下：
 int i = 31600000;
 int temp1=0,temp2=0;
 int day=0;
 int hour=0;
 int minutes=0;
 int second=0;

 temp1 = i%86400;
 day = (i-temp1)/86400;
 temp2 = temp1%3600;
 hour = (temp1-temp2)/3600;
 second = temp2%60;
 minutes = (temp2-second)/60;

 printf("This is %d Day %d Hour %d Minute %d Second!",day,hour,minutes,second);

#include<iostream>
using namespace std;

main()
{
 int num;
 int y,d,s,h,m,temp;
 const int year=31536000;  //一年=365*24*60*60=31536000秒
 const int day=86400;      //一天=24*60*60=86400秒
 const int hour=3600;      //一小时=60*60=3600秒  
 const int second=60;      //一分钟=60秒
 const int minutes=1; 
 
 cin>>num;
 if(num<0)
 {
  cout<<"输入数据有误，请重新输入......"<<endl;
  return 0;
 }
 
 if(num>=year)
 {
  y=num/year;
  temp=num%year;
  d=temp/day;
  temp=temp%day;
  h=temp/hour;
  temp=temp%hour;
  s=temp/second;
  temp=temp%second;
  m=temp; 
  cout<<num<<"  have  "<<"year:"<<y<<"  day:"<<d<<"  hour:"<<h<<"  second:"<<s
  <<"  minutes:"<<m<<endl;
 }
 else
 {
  y=0;  
  d=num/day;
  temp=num%day;
  h=temp/hour;
  temp=temp%hour;
  s=temp/second;
  temp=temp%second;
  m=temp; 
  cout<<num<<"  have  "<<"year:"<<y<<"  day:"<<d<<"  hour:"<<h<<"  second:"<<s
  <<"  minutes:"<<m<<endl;
 }
}