How do you read propane tank expiry date I know this is stamped into the collar on the tank but how exactly do you read it?

The expiry date stamped onto a collar or base of a gas tank can be written as numbers expressing the month and the two-digit year. In other places, it is expressed as a letter indicating the quarter, "A" meaning March, and "D" for December, and a 2 digit year. If a gas tank's expiry date has passed, then the tank will need to be tested before it can be refilled. Smaller tanks are often replaced, as they are worth less than the cost of retesting them.