Writing Your Own EA Part 100 – EA Expiration Dates If you’re new to this series and want to check it out from the beginning, you can find that here. And look here for a list of all the programming articles. In Part 99 we wrapped out discussion of price and trade size validation. As promised, this time we’ll talk about setting expiration dates in your code. Why have an expiration date? Well, one reason is for added security for ...