calendar assignment hell

/*
* prompt for month
*/
int getMonth()
{
   int month;
   cout << "Enter a month number: ";
   cin >> month;
   if (month < 1 || month > 12)
   {
      cout << "Month must be between 1 and 12." << endl;
      cin >> month;
   }
   return month;
}
/*
* prompt for year
*/
int getYear()
{
   int year;
   cout << "Enter year: ";
   cin >> year;
   if (year < 1753)
   {
      cout << "Year must be 1753 or later."<< endl;
      cin >> year;
   }
   return year;
}
/*
* to find it it's a leap year
*/
bool isLeapYear(int year)
{
   if (year % 4 == 0 && year % 100 == 0 || year % 400 == 0)
   {
      return true;
   }
   else
   {
      return false;
   }
}
/*
* to set the days in the month
*/
int daysInMonth(int month, int year)
{
   int numDays = 0;
   if (month == 1 || month == 3 || month == 5 || month == 7
       || month == 8 || month == 10 || month == 12)
   {
      numDays = 31;
      return numDays;
   }
   else if (month == 2)
   {
      if (isLeapYear(year))
      {
         numDays = 29;
      }
      else
      {
         numDays = 28;
      }
      return numDays;
   }
   else
   {
      numDays = 30;
      return numDays;
   }
   return numDays;
}
/*
* to calculate the year (obviously)
*/
int calcYears(int years)
{
   int year;
   years = year - 1753;

   return years;
}
/*
* to calculate the offset
*/
int computeOffset(int month, int year)
{
   int numDays;
   int years;
   int months = calcYears(years) * 12 + month - 1;

   for (int i = 0; i > months; i++)
   {
      numDays += daysInMonth(i % 12, i / 12);
   }

   int offset = numDays % 7;
   return offset;
}
/*
* to display the month and year
*/
int header(int month, int year)
{
   if (month == 1)
   {
      cout << "January, " << year;
else if (month == 2)
   {
      cout << "Febuary, " << year;
   }
   else if (month == 3)
   {
      cout << "March, " << year;
   }
   else if (month == 4)
   {
      cout << "April, " << year;
   }
   else if (month == 5)
   {
      cout << "May, " << year;
   }
   else if (month == 6)
   {
      cout << "June, " << year;
   }
   else if (month == 7)
   {
      cout << "July, " << year;
   }
   else if (month == 8)
   {
      cout << "August, " << year;
   }
   else if (month == 9)
   {
      cout << "September, " << year;
   }
   else if (month == 10)
   {
      cout << "October, " << year;
   }
   else if (month == 11)
   {
      cout << "November, " << year;
   }
   else if (month == 12)
   {
      cout << "December, " << year;
   }
   cout << endl;

   return 0;
}
/*
* to display the calendar
*/
void displayCalendar(int numDays, int offset)
{
   cout << endl;
   int month, year;
   header(month, year);
   cout << "  Su  Mo  Tu  We  Th  Fr  Sa\n";

   if (offset != 6)
   {
    for (int i = 0; i <= offset; i++)
      {
         cout << "        ";
      }
   }
   for (int day = 1; day < numDays; day++)
   {
      if (!(offset == 6 && day == 1))
      {
         if ((offset + day) % 7 == 0)
         {
            cout << endl;
         }
      }
      cout << setw(4) << day;
   }
   cout << endl;
}
/*
 * executing the program
 */
int main()
{
   int numDays = 0;
   int offset = 0;
   int month = getMonth();
   int year = getYear();
   offset = computeOffset(month, year);
   numDays = daysInMonth(month, year);

   displayCalendar(offset, numDays);
   return 0;
}