Where are custom node fields when creating a new action?

Hello all,

I am creating a new action in such a way that when I create a new content (custom content type with a "date" field) I execute a custom PHP code using actions. The problem is that in the "function node_execute_php_action(&$node, $context = array())" I do not know how to get the dates that the user has introduced when he/she created the node.

I need that dates in order to create a database entry that combines the node title with the dates...

Thanks in advance for your great help,

Rodrigo