Problem querying ended projects

Hi,

I’m trying to get the ended projects. In order to do this I’ve written a new function using “datum” meta_key in the way below:

$args = array (
‘showposts’ => -1,
‘post_type’ => ‘project’,
‘orderby’ => ‘post_date’,
‘post_status’ => ‘publish’,
‘project-category’ => $term->slug,
‘meta_query’ => array(
array(
‘key’ => ‘datum’,
‘value’ => date(get_option(‘date_format’),time()),
‘compare’ => ‘<‘,
))
);

Al the projects have “datum” field sets to “d/m/Y” and the date(get_option(‘date_format’),time()) give “08/02/2017”, but it seems that is not working good.
Is there some settings I forgot?

Thanks a lot.