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With general-purpose languages like JavaScript, though, this kind of thing is trivially easy, either with the language alone or with the help of a third-party package to make things even easier --- one like Day.js, for example:
IaC tools vary similarly. Classically declarative tools like Arc, CloudFormation, Terraform, and others have you type out what you want, usually in some sort of structured configuration, and handle the work of provisioning and updating for you. Imperative tools don't do nearly as much; instead, they give you the APIs to tell them what to do and how to do it.
Think of React. Why do we have it? Because HTML alone isn't enough, and imperative DOM scripting leads to reams of unmaintainable code. We got React because we, as developers, wanted to think about, and compose, our front-end applications in declarative ways --- but we needed to retain the flexibility of the JavaScript language. So we got React --- and with it, an imperatively declarative programming model for the web:
Moreover, if you were to run that code a second time (having made no changes to the YAML or JavaScript), nothing would happen, because the "desired state" you'd expressed in the arc.yaml file would already have been achieved: with those two endpoints deployed and running in the AWS cloud, Arc (by way of CloudFormation) would have nothing more to do for you. That's declarative infrastructure-as-code (IaC) at work: you describe what you want --- two HTTP endpoints --- and the IaC tool determines the how, computing the work to be done and then making it happen for you.