Time interval type

[Keats]

Often in configuration you want to say some duration like trial_duration = 14d.
This is a bit niche and hard to guess what would be the end type in the AST, I would say the number of milliseconds?

So in the AST the value of trial_duration would be 1000 * 60 * 60 * 24 * 14.
The main question is how to represent months since they have different number of days.

Ideally the AST output would be a timedelta object but not all languages have such things