This lambda function:

•Finds all instances in the selected region(s)

•Ensures all instances are tagged with "expiration_date" of "never" or with an integer (epoch time).

•Terminates any instances without an expiration_date

•Terminates any instances past their expiration date

•This may not work in large AWS accounts. For this reason I've split it out by region - you may specify a smaller array of regions at the top. If your account is exceptionally large, it would be a very minor effort to add an additional for loop that iterates over each VPC in a region. Feel free to add a PR!

•We use epoch time because integers are easy to compare and I'm lazy. Deal with it or fix it in your own environment :)

•If you tag your instance with an expiration_date that causes a ValueError, I don't think I've handled that properly. Please don't be manually tagging your stuff. We have terraform and cloudformation for this, people!