# `Localize.UnknownCalendarError`
[🔗](https://github.com/elixir-localize/localize/blob/v1.4.0/lib/localize/exception/unknown_calendar_error.ex#L1)

Exception returned when a calendar is not one Localize can use:
a name that is not a known CLDR calendar type, or a calendar
module that is neither `Calendar.ISO` nor answers the callbacks
Localize puts to a calendar, those of the Calendrical behaviour
and of the `Calendar` behaviour it extends.

# `t`

```elixir
@type t() :: %Localize.UnknownCalendarError{
  __exception__: term(),
  calendar: atom() | String.t() | nil
}
```

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