This happens because the create_date field does not exist in the "sale_report" model, which is the model used to create the reports, therefore the "sale_report" model should be inherited from code, add the create_date field and inherit the methods that load the reports. data in the view so that it also loads create_date. (Don't forget to add "sale" to the module dependencies). Then

Inherit model "sale_report" and add field:

class SaleReport(models.Model):  
	​_inherit = 'sale.report'

	​create_date = fields.Datetime('Order Date', readonly=True)​

The function that loads the data into the view

def _select_sale(self):

In this function you should add a line similar to this:

s.create_date as create_date

You can then edit the chart and change the date field to create_date