Modify Post Info

add_filter( 'genesis_post_info', 'custom_post_info' );
/**
 * Customizes post info.
 *
 * @param  string $post_info Existing post info.
 * @return string            Modified post info.
 */
function custom_post_info( $post_info ) {

    $post_info = 'April 6, 2018 by   ';

    return $post_info;

}