[ttkciar]

After having worked on accounting software for a living, which did need to precisely take into account the variable nature of time measurements, I greatly appreciate that Numbat has decided not to open that can of worms.

Using averaged constants like this isn't applicable to all use-cases, but has the virtues of being simple and easy to reason about.

IMO they did exactly the right thing by not trying to shoehorn an endless supply of complexity and pain into their language's type system. Users who do need to deal with date math can use a library.