How show post only from after custom date

Question

You can do this using query_posts() or a new WP_Query object. Here’s an example:

query_posts( array(
    'post_type' => 'my_post_type',
    'meta_query' => array(
        array(
           'key' => 'my_date_field_key',
           'value' => date( 'd/m/Y' ),
           'compare' => '<',
           'type' => 'DATE'
        )
    )
) );

if ( have_posts() ) : while( have_posts() ) : the_post();

    // your loop code here
    the_title('<h2>','</h2>');

endwhile; endif;

wp_reset_query();

NOTE:

If you want to order by date this is a little trickier unless you store the date as a unix timestamp. Then you can orderby meta_value_num as it’s just a number.