[IMP] sale: use fields.Datetime.now instead of datetime.now

Better because it correctly uses format / tz / ...

addons/sale/sale.py

@@ -108,7 +108,7 @@ class SaleOrder(models.Model):
     validity_date = fields.Date(string='Expiration Date', readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
         help="Manually set the expiration date of your quotation (offer), or it will set the date automatically based on the template if online quotation is installed.")
     create_date = fields.Datetime(string='Creation Date', readonly=True, index=True, help="Date on which sales order is created.")
-    confirmation_date = fields.Datetime(string='Confirmation Date', readonly=True, index=True,  help="Date on which the sale order is created.")
+    confirmation_date = fields.Datetime(string='Confirmation Date', readonly=True, index=True,  help="Date on which the sale order is confirmed.")
     user_id = fields.Many2one('res.users', string='Salesperson', index=True, track_visibility='onchange', default=lambda self: self.env.user)
     partner_id = fields.Many2one('res.partner', string='Customer', readonly=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, required=True, change_default=True, index=True, track_visibility='always')
     partner_invoice_id = fields.Many2one('res.partner', string='Invoice Address', readonly=True, required=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, help="Invoice address for current sales order.")
@@ -434,7 +434,7 @@ class SaleOrder(models.Model):
     def action_confirm(self):
         for order in self:
             order.state = 'sale'
-            order.confirmation_date = datetime.now()
+            order.confirmation_date = fields.Datetime.now()
             if self.env.context.get('send_email'):
                 self.force_quotation_send()
             order.order_line._action_procurement_create()