/** 
  * Sets the value of this field from the posted form.
  * @param array $post The $_POST array holding the values for this form.
  */
 public function setFromPost($post)
 {
     if (is_array($post)) {
         if (array_key_exists('month', $post)) {
             $this->setValue(I2CE_Date::getDay($post['day'], $post['month']));
             return;
         }
     } elseif (is_string($post)) {
         $this->setFromDB($post);
         return;
     }
     $this->setValue(I2CE_Date::getDay());
 }