covert May to 05

I will get data from text file. If let's say 03 May 2012 i want to convert it to 03-05-2012. Please can someone enlighten me how to do that?
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#include <iostream>
#include <fstream>
using namespace std;

const int MAX = 80;
const int MAXNO = 10;

struct Date
{
	int day;
	char month [MAX];
	int year;
};

struct Student
{
	char name [MAX];
	char nationality [MAX];
	Date birthDate;	   
	int no;
	char wishMessage [MAXNO] [MAX];
};

void myInfo (fstream&, char[], Student&, Date&);
void printmyInfo(fstream&, char[], Student&, Date&);

void myInfo(fstream& afile, char filename [], Student& a, Date& b)
{
	afile.open(filename, ios::in);
	if (!afile)
	{
		cout << "file opened for reading failed" << endl;
		exit (-1);
	}
	afile.getline(a.name, MAX);
	afile.getline(a.nationality, MAX);   
	afile >> b.day;
	afile >> b.month;
	afile >> b.year;
	if(b.month='May')
	strcpy(b.month,"05");
	afile >> a.no;
	afile.clear ();
	afile.ignore (100, '\n');
	int MAXNO=1;
	while(MAXNO<8)
	{  
	afile.getline(a.wishMessage[MAXNO], MAX);
	MAXNO++;
	}
	afile.close ();
}

void printmyInfo(fstream& afile, char filename [], Student& a, Date& b)
{
	cout << "My name is " << a.name << endl;
	cout << "My nationality is " << a.nationality << endl;
	cout << "MY date of birth is " << b.day << " - " << b.month << " - " << b.year << endl;
	cout << "I have " << a.no << " wishes:" << endl;
	for(int MAXNO=1;MAXNO<8;MAXNO++)
	{
	cout << " " << MAXNO << ": " << a.wishMessage[MAXNO] << endl;
	}
}

int main()
{
		srand(time (NULL));
		fstream afile;
		char filename [MAX];
		
		cout << "Enter your info file name: ";
		cin >> filename;
		Student a;
		Date b;
		myInfo(afile,filename,a,b);
		printmyInfo(afile,filename,a,b);
		
}
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