Ok thanks i understand, so i’ve used a wp calendar widget clone(https://pippinsplugins.com/custom-post-type-calendar-widget/) and i think
instead of using :
// Get days with posts
$dayswithposts = $wpdb->get_results( "SELECT DISTINCT DAYOFMONTH( post_date )
FROM $wpdb->posts WHERE MONTH( date ) = '$thismonth'
AND YEAR( post_date ) = '$thisyear'
AND post_type IN ( $post_types ) AND post_status = 'publish '"
, ARRAY_N );
i suppose i musts do something like :
$args = array (
'post_type' => 'post', // your custom post type
'meta_key' => 'date_de_la_manifestation', // your custom date field name
'orderby' => 'meta_value_num',
'order' => 'ASC',
'meta_query' => array(
array(
'key' => 'date_de_la_manifestation',
'compare' => 'REGEXP',
'value' => '[0-9]{4}' . $thismonth . '[0-9]{2}',
),
)
);
and after make a loop on result to get the day of my acf field date_de_la_manifestation and displays it in the calendar.
