Hello,
the order return slip shows the date from when the order was shipped. It should show the date from when the return was requested.
reproduce:
make an order. Mark as shipped. Wait a few days, then ask for order return in costumer account. If merchant set state for return "Waiting for package". Then customer can print out order return slip. And you will see underneath the order return number there is the date from when order was shipped and NOT from when return was requested. But there should be the date from return request.

Thanks a lot in advance for checking back 😊
Hi @didi-2018,
I did not manage to reproduce the issue with PS1.7.6.3.
Deleivery slip pdf

Credit Slip pdf

Merchandise Returns page

Thanks to check & feedback.
@khouloudbelguith please show me the date above under the return number

@didi-2018, thanks for your feedback.
I manage to reproduce the issue with PS1.7.5.2 and ps1.7.6.3.

I’ll add this to the debug roadmap so that it’s fixed. If you have already fixed it on your end or if you think you can do it, please do send us a pull request!
Thanks!
@khouloudbelguith thank you very much ♥
@khouloudbelguith I fixed it /classes/pdf/HTMLTemplateOrderReturn.php
line 47:
change:
$this->date = Tools::displayDate($this->order->invoice_date);
to:
$this->date = Tools::displayDate($this->order_return->date_add);

WOOOOHOOO 😄🌟
thanks for checking back and feedback
@didi-2018, Great!
If you have already fixed it on your end, please do send us a pull request!
Thanks!
@khouloudbelguith https://github.com/PrestaShop/PrestaShop/pull/17999 can you please check? I dont know if I have done that right 🙈. this is my first pull request.