C++ Date Comparison Function

Hi Readers, This is a method coded by me in my first year to compare two date values in char array and give the comparison in integer.

cmpDate(char *date1, char *date2)
{
 //date1>date2=-1 date1=date2=0 date1IndexOf("/");
 int i2=dt1->LastIndexOf("/");
 int i3=dt2->IndexOf("/");
 int i4=dt2->LastIndexOf("/");
 int dt1month=System::Convert::ToInt32(dt1->Substring(0,i1));
 int dt1day=System::Convert::ToInt32(dt1->Substring(i1+1,i2-i1-1));
 int dt1year=System::Convert::ToInt32(dt1->Substring(i2+1));
 int dt2month=System::Convert::ToInt32(dt2->Substring(0,i3));
 int dt2day=System::Convert::ToInt32(dt2->Substring(i3+1,i4-i3-1));
 int dt2year=System::Convert::ToInt32(dt2->Substring(i4+1));
 if(dt1year>dt2year)
  return -1;
 else
 {
  if(dt1year==dt1year)
  {
   if(dt1month>dt2month)
    return -1;
   else if(dt1month==dt2month)
   {
    if(dt1day>dt2day)
    {
     return -1;
    }
    if(dt1day<dt2day)
     return 1;
   }
  }
 }
 return 1;
}