Yes I'm using Odoo sh

So there is no other way to change the order date but through a technical intervention ?

Hi,
You can achieve this by editing the date_order field and creating a custom dictionary in the file sale_order.py in the module sale.
You need to change it as follows:
READONLY_FIELD_STATES_CUSTOM = {
    state: [('readonly', False)]
    for state in {'sale', 'done', 'cancel'}
}

Add this dictionary just after the imports.
Then change the date_order field as follows:
date_order = fields.Datetime(
        string="Order Date",
        states=READONLY_FIELD_STATES_CUSTOM,
        copy=False, required=True,
        help="Creation date of draft/sent orders,\nConfirmation date of "
             "confirmed orders.")

Hope it helps

Hi,

You can find the related code in odoo/addons/sale/models/sale_order.py line number 815.

self.write(self._prepare_confirmation_values())

Thanks