# `Calendrical.UnsupportedDateRangeError`

Exception raised when a date lies outside the range a calendar
can compute.

Astronomical calendars depend on underlying solar or lunar
computations that are only valid over a bounded span of years:
Astro answers for 50,000 years either side of 2000.
Dates outside that span raise this error rather than crashing
inside the underlying computation.

### Fields

* `:calendar` — the calendar module that could not compute the date.

* `:value` — the out-of-range date, year, or day count as given.

* `:range` — what bounds the supported range, as data: `{:from, year}`
  for the years from `year` on, written in the message as a whole
  translated sentence. Any other value, such as a range of years, is
  written as it is given.

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*Consult [api-reference.md](api-reference.md) for complete listing*