How can I edit all nodes of thier dates at once? Is there a module that allows me to change the dates of all nodes at once instead of doing it one by one thanks.
In this case, you could update the field in the db, much faster than node_loading and saving all the nodes with batch update etc.. backup db first.

Fields are:

node.created
node.changed
node_revision.timestamp (same as node changed)


e.g

$created = strtotime('2013-01-01 00:00:00');
$changed = REQUEST_TIME; // now

$query = db_update('node');
$query-&gt;fields(array('created' =&gt; $created, 'changed' =&gt; $changed));
$updated = $query-&gt;execute();

$query = db_update('node_revision');
$query-&gt;fields(array('timestamp' =&gt; $changed));
$updated = $query-&gt;execute();

drupal_flush_all_caches(); // clear cache