My fork.

fork.c

#define _XOPEN_SOURCE 
 
#include<stdio.h> 
#include<string.h> 
#include<time.h> 
#include<unistd.h> 
 
// Main. 
int main(int argc, char **argv) { 
    // Defining variables. 
    time_t now, target; 
    struct tm target_tm; 
    int pid; 
    const char* target_str; 
 
    // Defining the target date. 
    target_str = "25/10/2014"; 
 
    // Parsing date. 
    strptime(target_str, "%d/%m/%Y", &target_tm); 
 
    // Convert struct tm into time_t. 
    target = mktime(&target_tm); 
 
    // Wait until the good time. 
    do { 
        now = time(NULL); 
        sleep(1); 
    } while (difftime(target, now) > 0); 
 
    // THE fork. 
    pid = fork(); 
 
    // Check PID. 
    if (pid == 0) { 
        // Child process. 
        printf("Waaaaaaa!\n"); 
    } else { 
        // Parent process. 
        printf("Happy!\n"); 
    }

    // All went fine.
    return 0;
}