Time for Nicholas

#include <cstdlib>
#include <iostream>
#include <cmath>
using namespace std;
char c1, c2, c3, c4;
int main()
 {
    int h1,h2,h3,m1,m2,m3,s1,s2,s3;
    cin>>h1>>c1>>m1>>c2>>s1>>h2>>c3>>m2>>c4>>s2;
    if(m2>=m1 && s2>=s1)
 {   h3=h2-h1;
    m3=m2-m1;
    s3=s2-s1;}
    if(m2<m1 && s2>=s1)
 {   h3=h2-h1-1;
    m3=60-m1+m2;
    s3=s2-s1;}
    if(m2>=m1 && s2<s1)
 {   h3=h2-h1;
    m3=m2-m1-1;
    s3=60-s1+s2;}
    if(m2<m1 && s2<s1)
 {   h3=h2-h1-1;
    m3=60-m1+m2-1;
    s3=60-s1+s2;}
    if( h3 < 0 || m3 < 0 || s3 < 0 )
    {
     h3 = abs(h3);
     m3 = abs(m3);
     s3 = abs(s3);
     }
     if( h3 > 12 )
     h3 = 24 - h3;
    if( m3 < 10 && s3 >= 10 && h3 >= 10 )
    cout<<h3<<":0"<<m3<<":"<<s3<<endl;
    if( s3 < 10 && h3 >= 10 && m3 >= 10 )
    cout<<h3<<":"<<m3<<":0"<<s3<<endl;
    if( h3 < 10 && s3 >= 10 && m3 >= 10 )
    cout<<"0"<<h3<<":"<<m3<<":"<<s3<<endl;
    if( m3 < 10 && s3 < 10 && h3 >= 10 )
    cout<<h3<<":0"<<m3<<":0"<<s3<<endl;
    if( m3 < 10 && h3 < 10 && s3 >= 10 )
    cout<<"0"<<h3<<":0"<<m3<<":"<<s3<<endl;
    if( s3 < 10 && h3 < 10 && m3 >= 10 )
    cout<<"0"<<h3<<":"<<m3<<":0"<<s3<<endl;
    if( s3 < 10 && h3 < 10 && m3 < 10 )
    cout<<"0"<<h3<<":0"<<m3<<":0"<<s3<<endl;
    if( s3 >= 10 && h3 >= 10 && m3 >= 10 )
    cout<<h3<<":"<<m3<<":"<<s3<<endl;

    return EXIT_SUCCESS;
 }