Need help with rewrite_rules_array

Try this:

function when_rewrite_rules( $wp_rewrite ) {
  $new_rules = array();
  $new_rules['category/tasks/(\d*)$'] = 'index.php?when=$matches[1]';
  $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}
add_filter('generate_rewrite_rules','when_rewrite_rules');

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