Date based URLs for custom posts and pagination

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Calling $GLOBALS[“wp_rewrite”]->flush_rules() did make everything work as I required but that wouldn’t be a good solution.

Actually, you have to flush the rewrite rules after modifying them (i.e. also when registering custom post types).

Also, you should never rely on these global variables. WordPress provides specific functions for nearly everything. For example, use flush_rewrite_rules() instead of $GLOBALS["wp_rewrite"]->flush_rules(). It’s more future-proof and maintainable.

It’s important you call these functions at the appropriate action hooks, to ensure all needed classes and functions are loaded. When, wrapped in a plugin, it could look like this (untested!):

    function events_87669_query_vars( $qvars ) {
    $qvars[] = 'event_year';
    $qvars[] = 'event_monthnum';
    $qvars[] = 'event_day';
    return $qvars;
}
add_filter('query_vars', 'events_87669_query_vars' );

function events_87669_rewrite_rules() {
    add_rewrite_tag("%event%", "([^/]+)", "event=");
    add_rewrite_tag("%event_year%", "([0-9]{4})", "event_year=");
    add_rewrite_tag("%event_monthnum%", "([0-9]{1,2})", "event_monthnum=");
    add_rewrite_tag("%event_day%", "([0-9]{1,2})", "event_day=");

    add_permastruct("event", "/event/%event_year%/%event_monthnum%/%event_day%/%event%", false);
}

add_action( 'init', 'events_87669_rewrite_rules' );

function events_87669_activation() {
    // Ensure our rewrite rules exist on plugin activation
    events_87669_rewrite_rules();

    flush_rewrite_rules();
}

function events_87669_activation() {
    flush_rewrite_rules();
}

register_activation_hook( __FILE__, 'events_87669_activation' ) );
register_deactivation_hook( __FILE__, 'events_87669_deactivation' ) );

This code does basically the same as yours, except it properly flushes the rewrite rules on plugin activation/deactivation. Also, we ensure the newly added rewrite rules exist on activation. And as you can see, there’s a special filter for adding custom query vars.

A good example for custom queries can be found at the WordPress Codex: http://codex.wordpress.org/Custom_Queries
If you want to learn more about hooks and filters: http://codex.wordpress.org/Plugin_API

If anybody knows a better solution, let me know 🙂

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