T.date

A scalar.

T.date.whereby({ min: new Date("2020-01-01"), max: new Date() });
T.date.whereby({
  min: { value: new Date("2020-01-01"), exclusive: true },
  max: new Date(),
});
T.date.past; // any instant from the earliest representable up to "now"
T.date.future; // any instant from "now" up to the latest representable
T.date.past.whereby({ min: new Date("2020-01-01") });
T.date.future.whereby({ max: new Date("2030-01-01") });

.past / .future are usable bare, or refined with their own .whereby(). Both accept a distribution — see Distributions. Exclusive min/max drop the excluded millisecond: Date stores a whole millisecond, so an exclusive end is the next (or previous) representable instant, not a fractional nudge.

"Now" here means initialize({ clock }). By default that is the wall-clock instant of the initialize() call — so a bare T.date.past / .future draws relative to the actual present. Pass initialize({ clock: someDate }) to freeze "now" to a fixture date, or clock: "seeded" to derive an arbitrary instant from the instance seed (drawn across the entire representable Date range — an implausible date is the expected outcome of that policy). See What "now" means.