I got:
$args = array(
'post_type' => 'foto_archief',
'orderby' => 'meta_value_num',
'meta_key' => 'date',
'order' => 'ASC',
'posts_per_page' => -1
);
but it only filters on month
so I got first jan
than feb
ect… but the years and dates are all over the place.
My input date is 10/20/2016
and my output date is 24 januari, 2011