你已经爱我多久了

#include<iostream>
#include<cstdio>
using namespace std;
long long a,b,c,d,e,f,x;
char o,p,r,s;
int mouth1[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};
int mouth2[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int main()
{
    cin>>a>>o>>b>>p>>c>>d>>r>>e>>s>>f>>x;
    f=f+x;
    if(f>=60)
    {
        e=e+f/60;
        f=f%60;
    }
    if(e>=60)
    {
        d=d+e/60;
        e=e%60;
    }
    if(d>=24)
    {
        c=c+d/24;
        d=d%24;
    }
    while(1)
    {
        int falg=0;
        if((a%4==0&&a%100!=0)||(a%400==0))
          {
              for(int i=b;i<=b+12;i++)
            {
                if(i==13)
                    a++;
                  if(c>mouth1[i%13])
                    c=c-mouth1[i%13];
                else 
                {
                    falg=1;
                    b=i%13;
                    break;
                }
            }
        }
        else
        {
              for(int i=b;i<=b+12;i++)
            {
                if(i==13)
                    a++;
                  if(c>mouth2[i%13])
                    c=c-mouth2[i%13];
                else 
                {
                    falg=1;
                    b=i%13;
                    break;
                }
            }
        }
        if(falg)
            break;
    }
    cout<<a<<o;
    if(b<10)
        cout<<"0"<<b<<p;
    else 
        cout<<b<<p;
    if(c<10)
        cout<<"0"<<c<<" ";
    else 
        cout<<c<<" ";
    if(d<10)
        cout<<"0"<<d<<r;
    else 
        cout<<d<<r;
    if(e<10)
        cout<<"0"<<e<<s;
    else 
        cout<<e<<s;
    if(f<10)
        cout<<"0"<<f;
    else 
        cout<<f;
    return 0;
}