Index: trunk/core/units/categories/categories_config.php
===================================================================
diff -u -r1566 -r2011
--- trunk/core/units/categories/categories_config.php	(.../categories_config.php)	(revision 1566)
+++ trunk/core/units/categories/categories_config.php	(.../categories_config.php)	(revision 2011)
@@ -62,7 +62,7 @@
 									            'ParentId' => Array('type' => 'int','not_null' => '1','default' => '0'),
 									            'Name' => Array('type' => 'string','not_null' => '1','default' => ''),
 									            'Description' => Array('type' => 'string','not_null' => '1','default' => ''),
-									            'CreatedOn' => Array('formatter' => 'kDateFormatter', 'default'=>mktime(), 'not_null' => '1'),
+									            'CreatedOn' => Array('formatter' => 'kDateFormatter', 'default'=>'#NOW#', 'not_null' => '1'),
 									            'EditorsPick' => Array('type' => 'int','default' => ''),
 									            'Status' => Array('type' => 'int','not_null' => '1','default' => '0'),
 									            'Pop' => Array('type' => 'int','default' => ''),
Index: trunk/core/kernel/db/db_event_handler.php
===================================================================
diff -u -r1906 -r2011
--- trunk/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 1906)
+++ trunk/core/kernel/db/db_event_handler.php	(.../db_event_handler.php)	(revision 2011)
@@ -203,6 +203,7 @@
 		function dbBuild(&$object,&$event)
 		{
 			$object->Configure();
+			$this->PrepareObject($event);
 			
 			$live_table = $event->getEventParam('live_table');
 			
@@ -222,6 +223,17 @@
 		}
 		
 		/**
+		 * Apply custom object modifications
+		 * after it's initialization
+		 *
+		 * @param kEvent $event
+		 */
+		function PrepareObject(&$event)
+		{
+			
+		}
+		
+		/**
 		 * Builds item (loads if needed)
 		 *
 		 * @param kEvent $event
Index: trunk/kernel/units/categories/categories_config.php
===================================================================
diff -u -r1566 -r2011
--- trunk/kernel/units/categories/categories_config.php	(.../categories_config.php)	(revision 1566)
+++ trunk/kernel/units/categories/categories_config.php	(.../categories_config.php)	(revision 2011)
@@ -62,7 +62,7 @@
 									            'ParentId' => Array('type' => 'int','not_null' => '1','default' => '0'),
 									            'Name' => Array('type' => 'string','not_null' => '1','default' => ''),
 									            'Description' => Array('type' => 'string','not_null' => '1','default' => ''),
-									            'CreatedOn' => Array('formatter' => 'kDateFormatter', 'default'=>mktime(), 'not_null' => '1'),
+									            'CreatedOn' => Array('formatter' => 'kDateFormatter', 'default'=>'#NOW#', 'not_null' => '1'),
 									            'EditorsPick' => Array('type' => 'int','default' => ''),
 									            'Status' => Array('type' => 'int','not_null' => '1','default' => '0'),
 									            'Pop' => Array('type' => 'int','default' => ''),
Index: trunk/core/kernel/kbase.php
===================================================================
diff -u -r1560 -r2011
--- trunk/core/kernel/kbase.php	(.../kbase.php)	(revision 1560)
+++ trunk/core/kernel/kbase.php	(.../kbase.php)	(revision 2011)
@@ -259,6 +259,17 @@
 	}
 	
 	/**
+	 * Adds calculated field declaration to object.
+	 *
+	 * @param string $name
+	 * @param string $sql_clause
+	 */
+	function addCalculatedField($name, $sql_clause)
+	{
+		$this->CalculatedFields[$name] = $sql_clause;
+	}
+	
+	/**
 	* Sets ID Field name used as primary key for loading items
 	*
 	* @access public
@@ -316,7 +327,13 @@
 	
 	function SetDefaultValues()
 	{
-		
+		foreach($this->Fields as $field => $options)
+		{
+			if($options['default'] == '#NOW#')
+			{
+				$this->Fields[$field]['default'] = mktime();
+			}
+		}
 	}
 	
 	function SetFieldOptions($field, $options)
@@ -381,7 +398,7 @@
 				
 				$options_hash = getArrayValue($field_options,'options');
 				if($options_hash === false) $options_hash = Array();
-				
+								
 				$dynamic_options = $this->Conn->GetCol($sql, $field_options['option_key_field']);
 				$field_options['options'] = array_merge_recursive2($options_hash, $dynamic_options);