Beginner Request help w/ Assignment

My assignment to convert dates to European Date, Julian Date, Military Date, and Business date is due in 8 hours and I can't figure out how to fix the errors. Upon compiling I get these errors:

21: Undefined symbol 'GetDatemonth' in function main()
45: If statement missing ( in function GetDate(int &,int &,int &)
55: Declaration syntax error in function GetDate(int &, int &, int&)
221: Declaration missing ; in function GetDate(int &, int &, int &)
221: Compound statement missing } in function GetDate(int &, int &, int &)

Here is my code:
//program to display Eropean Date, Julian Date, Military Date, and Business date formats.

#include <stdio.h>
#include <string.h>

#define TRUE 1
#define FALSE 0

int GetDate (int &month, int &day, int &year);
void Europe (int month, int day, int year);
void Julian (int month, int day, int year);
void Military (int month, int day, int year);
void Business (int month, int day, int year);



void main (void)
{
int month, day, year;
GetDate (month, day, year);
while (GetDatemonth > 12)
{
printf ("Data entered was invalid!\n");
printf ("Now go home and think about what you have done!\n");
break;

}
Europe (month, day, year);
Julian (month, day, year);
Military (month, day, year);
Business (month, day, year);


return;

}

int GetDate (int &month, int &day, int &year)

{
printf ("Please enter a US date format (mm/dd/yr) \n");
scanf ("%d/%d/%d" ,&month, &day, &year);
while(1)
{
if {0 < month > 13 && 0 < day > 32 && 0 < year > 100)
else
break;
printf ("Date entered = \t\t\t%d/%d/%d\n" ,month, day, year);
}
return 0;
}


void Europe (int month, int day, int year)
{
printf ("European format =\t\t%d/%d/%d\n", day, month, year);


return;
}


void Julian (int month, int day, int year)
{
int days;
switch (month)
{
case 1:
days =day;
break;
case 2:
days = 31 + day;
break;
case 3:
days = 31 + 28 + day;
break;
case 4:
days = 31 + 28 + 31 + day;
break;
case 5:
days = 31 + 28 + 31 + 30 + day;
break;
case 6:
days = 31 + 28 + 31 + 30 + 31 +day;
break;
case 7:
days = 31 + 28 + 31 + 30 + 31 + 30 + day;
break;
case 8:
days = 31 + 28 + 31 + 30 + 31 + 30 + 31 + day;
break;
case 9:
days = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + day;
break;
case 10:
days = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + day;
break;
case 11:
days = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + day;
break;
case 12:
days = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + day;
break;
}

printf ("Julian format =\t\t\t%d", year);
if (days >0 && days < 10)
printf ("00%d", days);
if (days >=10 && days < 100)
printf ("0%d", days);
if (days >=100 && days <= 366)
printf ("%d", days);

printf ("\n");
return;
}

void Military (int month, int day, int year)
{
char Month[15];
switch (month)
{
case 1:
strcpy(Month,"JAN");
break;
case 2:
strcpy(Month,"FEB");
break;
case 3:
strcpy(Month,"MAR");
break;
case 4:
strcpy(Month,"APR");
break;
case 5:
strcpy(Month,"MAY");
break;
case 6:
strcpy(Month,"JUN");
break;
case 7:
strcpy(Month,"JUL");
break;
case 8:
strcpy(Month,"AUG");
break;
case 9:
strcpy(Month,"SEP");
break;
case 10:
strcpy(Month,"OCT");
break;
case 11:
strcpy(Month,"NOV");
break;
case 12:
strcpy(Month,"DEC");
break;
}
printf ("Military format =");
if (day < 10)
printf ("\t\t0%d-", day);
if (day >= 10)
printf ("\t\t%d-", day);
printf ("%s-", Month);
printf ("19%d\n", year);




return;
}

void Business (int month, int day, int year)
{
char Month[15];
switch (month)
{
case 1:
strcpy(Month,"January");
break;
case 2:
strcpy(Month,"February");
break;
case 3:
strcpy(Month,"March");
break;
case 4:
strcpy(Month,"April");
break;
case 5:
strcpy(Month,"May");
break;
case 6:
strcpy(Month,"June");
break;
case 7:
strcpy(Month,"July");
break;
case 8:
strcpy(Month,"August");
break;
case 9:
strcpy(Month,"September");
break;
case 10:
strcpy(Month,"October");
break;
case 11:
strcpy(Month,"November");
break;
case 12:
strcpy(Month,"December");
break;
}
printf ("Business format =\t\t%d %s 19%d\n", day, Month, year);


return;
}

Let's see...

*First of all, you're referencing 'GetDatemonth' in your main function. There doesn't appear to be a variable or function with this name; I can only assume you meant to use 'month' instead.

*The second error is caused because you haven't given a statement for the 'if' portion of the if/else clause in GetDate(). Even if you don't perform any operations, you still need to add a semicolon before the else:

if {0 < month > 13 && 0 < day > 32 && 0 < year > 100)
; // Do nothing
else
break;

By the way, you can't specify Boolean conditions this way. '<' and '>' are binary operators, and you need to have exactly two operands for each. It would be nice to use statements like '0 < month > 13', but this is illegal in c/c++.

Thanks to everyone for your help. I made corrections and understand my errors. It is now running! THANKS MUCH!!!