add some comment

htdocs/reception/class/reception.class.php

@@ -80,8 +80,14 @@ class Reception extends CommonObject
 	 * @var int
 	 */
 	public $date_reception;
-    public $date_creation;
-    public $date_valid;
+    
+	/**
+	 * @var integer|string date_creation
+	 */
+	public $date_creation;
+    
+	
+	public $date_valid;
 
     public $meths;
     public $listmeths;			// List of carriers

htdocs/societe/class/societe.class.php

@@ -316,11 +316,12 @@ class Societe extends CommonObject
 	 * @var string
 	 */
 	public $user_modification;
-	/**
-	 * Date of creation
-	 * @var string
+	
+	/**	     
+	 * @var integer|string date_creation
 	 */
 	public $date_creation;
+	
 	/**
 	 * User that created the thirdparty
 	 * @var User

htdocs/societe/class/societeaccount.class.php

@@ -124,7 +124,13 @@ class SocieteAccount extends CommonObject
 	public $date_last_login;
 	public $date_previous_login;
 	public $note_private;
+	
+	/**
+	 * @var integer|string date_creation
+	 */
 	public $date_creation;
+	
+	
 	public $tms;
 
 	/**