The WP_Query page on the Codex has a section on Order & Orderby Parameters.
If you want to order the query by a custom field you should add 'orderby' => 'meta_value' AND you must also specify the custom field (called your_date_field in the above example) using the meta_key key in the query.
$timeline_query = new WP_Query(array(
'post_type' => 'post',
'orderby' => 'meta_value',
'meta_key' => 'your_date_field'
'posts_per_page' => -1
));
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