Try:
$postslist = get_posts( 'orderby=ID&numberposts=15' );
Here, we’re ordering by the ID, which should relate to when the posts were added to the database.
Try:
$postslist = get_posts( 'orderby=ID&numberposts=15' );
Here, we’re ordering by the ID, which should relate to when the posts were added to the database.