Drupal 7, save new node while editing old - drupal

Question

My need is to change behavior of edit form, for several content types.
The objective is:
-After update button has been pressed, don't update the node but create a new one with values from old node. I could do that by passing old node's fields values to "/node/add/my_content" form but this require a lot of work (the forms are quite complicated) and on edit page i have already all values ready in my fields.
So i already tried hook_form_alter
function mymodule_form_alter (&$form, &$form_state, $form_id) {
switch ($form_id) {
case 'my_not_update_form':
$node = $form_state['node'];
if (!isset($node->nid) || isset($node->is_new)) {
// This is a new node.
}
else {
$new_node = new StdClass();
$new_node->type = 'my_not_update_form';
node_object_prepare($new_node);
$new_node->uid = $user->uid;
$new_node->language = 'und';
$new_node->title = NULL;
$form['vid']['#value'] = NULL;
$form['nid']['#value'] = NULL;
$form['created']['#value'] = $new_node->created;
$form['changed']['#default_value'] = NULL;
$form['#node'] = $new_node;
$form['#entity'] = $new_node;
$form_state['node'] = $new_node;
$form_state['build_info']['args'][0] = $new_node;
}
break;
}
}
So with the above code i'm able to create a new node but the "create date" parameter always stay the same as create date parameter of an old node and none of the above line can solve that problem.

Answer 1

If you want to create an entirely new node when you submit edits to an existing node, then you want to use hook_node_presave(), which allows you to set any property of the node object before it's saved to the database.
In this example unsetting the nid and vid, and explicitly setting the is_new property will achieve this:
function my_module_node_presave($node) {
unset($node->nid);
unset($node->vid);
$node->is_new = TRUE;
}
This will leave the existing node untouched and unedited, and will instead create an entirely new node.

Answer 2

So to fully change the behavior of form update i give up on hook_form_alter() and instead i used hook_node_presave
function mymodule_node_presave($node) {
if($node->is_new == FALSE || isset($node->nid)) {
unset($node->nid);
unset($node->vid);
unset($node->vuuid);
$node -> created = time();
$node -> timestamp = time();
$node-> is_new = TRUE;
$node -> changed = time();
unset($node->revision_timestamp);
unset($node->num_revisions);
unset($node->current_revision_id);
unset($node->is_current);
unset($node->is_pending);
unset($node->revision_moderation);
unset($node->date);
unset($node->vuuid);
unset($node->data);
}
}