Converts the number of seconds since January 1, January 1, 1970

#include <iostream>using namespace std;bool IsRound(int year){ if((year%100)&&(year%4==0)) return 1; if((year%100==0)&&(year%400==0)) return 1; return 0;}int main() { int n; int year_s[2]= {365*24*60*60, 366*24*60*60}; int month_s[2][12]={{31,28,31,30,31,30,31,31,30,31,30,31},   {31,29,31,30,31,30,31,31,30,31,30,31}}; int day_s = 24*60*60; int hour_s = 60*60; int minute_s = 60;  while(cin>>n){    int temp = n;    int year=1970;         int month=1;         int day=1;         int hour=0;         int minute=0;         int second=0;    while(temp>=60){     int flag= IsRound(year);     if(temp>=year_s[flag]) { year++; temp-=year_s[flag]; }     else if(temp>=day_s){      int days = temp/day_s;      temp=temp%day_s;      int i=0;      int flag = IsRound(year);      int hh=31;      while(days>=hh){       days-=month_s[flag][i++];       hh=month_s[flag][i];       }      month+= i;      day+=days;     }else if(temp>=hour_s){          hour=temp/hour_s;          temp%=hour_s;     }else if(temp>=minute_s){           minute = temp/minute_s;           temp%=minute_s;     }     }     second = temp;        cout<<year<<"-";      if(month/10==0) cout<<"0";      cout<<month<<"-";      if(day/10==0) cout<<"0";      cout<<day<<" ";      if(hour/10==0) cout<<"0";      cout<