This is not about "future" or "past" dates but (to use Temporal as a common language) whether the date is an Instant or a ZonedDateTime conceptually. I think t

This is not about "future" or "past" dates but (to use Temporal as a common language) whether the date is an Instant or a ZonedDateTime conceptually. I think that's essentially what you mean, but it's an important distinction. It's use-case based. Making a data type time-based will not simplify, but only complicate things. [0] https://tc39.es/proposal-temporal/docs/ https://tc39.es/proposal-temporal/docs/