I don't understand why this code isn't performing properly - c++

Question

/* Program Name: BadDate.cpp
Function: This program determines if a date entered by the user is valid.
Input: Interactive
Output: Valid date is printed or user is alerted that an invalid date was entered
*/
#include <iostream>
bool validateDate(int, int, int);
using namespace std;
int main()
{
// Declare variables
int year;
int month;
int day;
const int MIN_YEAR = 0, MIN_MONTH = 1, MAX_MONTH = 12, MIN_DAY = 1, MAX_DAY = 31;
bool validDate = true;
This is the work of the housekeeping() method
Get the year, then the month, then the day
int housekeeping() {
cout << "Please enter a year: "<< endl;
cin >> year;
cout << "Please enter a month: "<< endl;
cin >> month;
cout << "Please enter a day: "<< endl;
cin >> day;
}
This is the work of the detailLoop() method
Check to be sure date is valid
int detailLoop() {
if(year <= MIN_YEAR) // invalid year
validDate = false;
else if (month < MIN_MONTH || month > MAX_MONTH) // invalid month
validDate = false;
else if (day < MIN_DAY || day > MAX_DAY) // invalid day
validDate = false;
}
This is the work of the endOfJob() method
test to see if date is valid and output date and whether it is valid or not
int endOfJob()
{
if(validDate == true)
{
// Output statement
cout << " Your date is valid!"<< endl;
}
else
{
// Output statement
cout << " Your date is not valid!"<< endl;
}
}
} // end of main() function