private function set($year, $month, $day)
    {
    
        $this->current_date = time();
        $this->current_day = date('d', $this->current_date);
        $this->current_month = date('m', $this->current_date);
        $this->current_year = date('Y', $this->current_date);
    
        // If no month nor year is specified, current month and year will be used
        if($year == false && $month == false)
        {
        
            $this->active_date = $this->current_date;
            $this->active_day = $this->current_day;
            $this->active_month = $this->current_month;
            $this->active_year = $this->current_year;
        
        }
        
        // If month is specified
        elseif($year == false && $month != false)
        {
        
            $this->active_date = mktime(0, 0, 0, $month, $day, $this->current_year);
            $this->active_day = date('d', $this->active_date);
            $this->active_month = date('m', $this->active_date);
            $this->active_year = date('Y', $this->active_date);
        
        }
        
        // If year is specified
        elseif($year != false && $month == false)
        {
        
            $this->active_date = mktime(0, 0, 0, $this->current_month, $day, $year);
            $this->active_day = date('d', $this->active_date);
            $this->active_month = date('m', $this->active_date);
            $this->active_year = date('Y', $this->active_date);
        
        }
        
        // If both year and month is specified
        else
        {
        
            $this->active_date = mktime(0, 0, 0, $month, $day, $year);
            $this->active_day = date('d', $this->active_date);
            $this->active_month = date('m', $this->active_date);
            $this->active_year = date('Y', $this->active_date);
        
        }
    
    }