[FIX] pos_restaurant: Timezone inconsistency in draft orders

Right now when you create an order (order A) in a POS with tables the
`date_order` is being set correctly (in UTC, so is shown in the back-end
with the user's timezone), but after you return to the Floor Screen or go to
another order (order B) and then go back to the order A and you add
another product and the order is saved (not paid) when you check that
order in the back-end now the `date_order` it says another value not the
one of the user's.

This is happening because when the JS received the back-end information
to open the order for the second time the date come in the User's
timezone and the server's timezone, and that info was saved but taking
it like UTC.

Now instead of storing inconsistent information in the DB (server side), we
are going to modify the information that is shown in the POS (client side),
so that both sides show the same date.

This will only apply in the POS where tables are being used since the
orders are only synchronized (back-end) when the option `is_table_management`
is set in the POS (`pos.config`).

closes odoo/odoo#110832

X-original-commit: 168d0e12120ced7b1093d39b10cd79c85c56aad0
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>

addons/pos_restaurant/models/pos_order.py

@@ -178,12 +178,11 @@ class PosOrder(models.Model):
         self._get_order_lines(table_orders)
         self._get_payment_lines(table_orders)
 
-        timezone = pytz.timezone(self._context.get('tz') or self.env.user.tz or 'UTC')
         for order in table_orders:
             order['pos_session_id'] = order['session_id'][0]
             order['uid'] = search(r"\d{5,}-\d{3,}-\d{4,}", order['pos_reference']).group(0)
             order['name'] = order['pos_reference']
-            order['creation_date'] = order['create_date'].astimezone(timezone)
+            order['creation_date'] = order['create_date']
             order['server_id'] = order['id']
             if order['fiscal_position_id']:
                 order['fiscal_position_id'] = order['fiscal_position_id'][0]

addons/pos_restaurant/static/src/js/models.js

@@ -369,6 +369,7 @@ patch(Order.prototype, "pos_restaurant.Order", {
         if (this.pos.config.module_pos_restaurant) {
             if (this.pos.config.iface_floorplan) {
                 this.tableId = json.table_id;
+                this.validation_date = moment.utc(json.creation_date).local().toDate();
             }
             this.customerCount = json.customer_count;
         }