usort($posts, function($a, $b) {
$dateA = get_field('acc_aanvangsdatum', $a->ID);
$dateB = get_field('acc_aanvangsdatum', $b->ID);
return strtotime($dateB) - strtotime($dateA);
});
“d/m/Y” is not an valid date format for strtotime()
https://www.php.net/manual/en/datetime.formats.php
strtotime() should be interpreting “d/m/Y” as “m/d/Y” so the return should still be within the “Year”, so I’m not sure why it would be an issue, but it’s the only thing that I can see to cause it.
