I exclusively use Lambda with Cloudwatch Rules for all the crons I write these days. It just works out of the box.

You should check out EventBridge Scheduler. Just released last month and seems like the go-to solution for such things going forward. I especially like the "run once at this time in the future" feature.

Is that the same event source that's been available to the aws::serverless::function transform for awhile now?

That’s neat! I remember hacking that together at an old job using step functions with a “pause until Timestamp” step.

Yeah, this is exactly where my mind went too. I think it’s a great example of not jumping to technical solutions too fast. The poster was so locked in on specifically cron as a solution that they forgot what they really want is code or jobs to run on a schedule and then missed alternate solutions.

Yep and with the CDK it's not only easy to spin up, it's super easy to connect services to it.

I wrote a notifier for when a local business has open appointments. A quick fetch every day and connected it to SNS seamlessly. Now I can easily add family members if they want the notifications and they can easily unsubscribe right from the email. All within the free tier.

You get something like a million lambda executions per month in the free tier.