add order date to commerce-order-receipt.html.twig

The "completed" time is when the order state was set to "completed", which is likely not the case when the order is placed... You're likely looking for the order placed time instead...
Also, this would just print a timestamp which is probably not what you want... Additionally, support requests are generally not answered from this queue.

I think you're looking for "getPlacedTime".
So something like...
({{ order_entity.getPlacedTime|format_date('html_date') }})

Automatically closed - issue fixed for 2 weeks with no activity.

Just to confirm

({{ order_entity.getPlacedTime|format_date('html_date') }})

works

Thanks