In your code ( $query->is_home() && $query->is_date() && $query->is_main_query() )
always returns false
because $query->is_home()
and $query->is_date()
cannot be true
on same page.
Try this,
function add_custom_post_type_to_query( $query ) {
if ( ! is_admin() && $query->is_main_query() ) {
if ( $query->is_date() || $query->is_home() ) {
$query->set( 'post_type', array('post', 'pictures') );
}
}
}
add_action( 'pre_get_posts', 'add_custom_post_type_to_query' );
I hope this helps!