Time class

istream& operator>> (istream& in , Time &t)
{
  char startTime[80];
  char endTime[80];
  char *ptr
  int hour, minute;

  cout<<"Start time >> ";
  in>>startTime;
  ptr = strtok(startTime, ":");
  hour = atoi(ptr);
  while (hour > 12 || hour < 1)
  {
    cout<<"Hour must be between 1 and 12."<<endl;
    cout<<"Format of time is hh:mm PM or hh:mm AM."<endl<<endl;
    cout<<"Time >> ";
    in>>startTime;
    ptr = strtok(startTime, ":");
    hour = atoi(ptr);
  }