How do I determine the date of supply for a one-time sale of goods?

The date of supply for a one-time sale of goods is the date on which one of the following scenarios occurs:

• If the goods are supplied to the customer using any form of transportation, the date of supply is when the transportation begins.
• If the supply of goods do not require transportation, the date of supply is when the goods are in the customer’s possession.
• If there is any assembly or installation required, the date of supply is when the assembly or installation process is complete.