4. With the address of the company placing the order
When an order is placed, the date is mentioned with the address of the company in the letter.
When we purchase anything online or offline, we get receipt which contain the order details like date & time of purchase, name of company & customer, amount spend on the order and details of taxes like GST, VAT... etc.
The date & time of purchase is mentioned with the address of the company in the letter.