Did you know that WordPress appends a /date/ prefix to date archives if you use %post_id% in the permalinks structure? I didn't.

fix-my-date.php

<?php
/**
 * Plugin Name: Fix my /date/
 */
function fix_my_date() {
	global $wp_rewrite;
	$wp_rewrite->date_structure = '%year%/%monthnum%/%day%';
}
add_action( 'init', 'fix_my_date' );