diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index b361860278e..11088a49000 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -381,7 +381,7 @@ class PosOrder(models.Model):
     @api.depends('date_order', 'company_id', 'currency_id', 'company_id.currency_id')
     def _compute_currency_rate(self):
         for order in self:
-            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, order.date_order)
+            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, order.date_order.date())
 
     @api.depends('lines.is_total_cost_computed')
     def _compute_is_total_cost_computed(self):
diff --git a/addons/pos_sale/models/pos_order.py b/addons/pos_sale/models/pos_order.py
index 534ccc869a3..0b666f54b73 100644
--- a/addons/pos_sale/models/pos_order.py
+++ b/addons/pos_sale/models/pos_order.py
@@ -26,7 +26,7 @@ class PosOrder(models.Model):
     def _compute_currency_rate(self):
         for order in self:
             date_order = order.date_order or fields.Datetime.now()
-            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, date_order)
+            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, date_order.date())
 
     def _prepare_invoice_vals(self):
         invoice_vals = super(PosOrder, self)._prepare_invoice_vals()