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15 changes: 13 additions & 2 deletions spec/registry.md
Original file line number Diff line number Diff line change
Expand Up @@ -1095,20 +1095,31 @@ For more information, see [Working with Timezones](https://w3c.github.io/timezon
> Support for these extensions is expected to be required in the post-tech preview.
> See: https://datatracker.ietf.org/doc/draft-ietf-sedate-datetime-extended/


### Date and Time Override Options

**_<dfn>Date/time override options</dfn>_** are _options_ that allow an _expression_ to
override values set by the current locale,
or provided by the _formatting context_ (such as the default time zone),
or embedded in an implementation-defined date/time _operand_ value.

The following REQUIRED option and its values MUST be available on
The following _option_ and its values are REQUIRED to be available on
the functions `:datetime` and `:time`:

- `hour12`
- `true`
- `false`

The following _options_ and their values are RECOMMENDED to be available on
the functions `:datetime`, `:date`, and `:time`.
The maturity level for each is **Proposed**.

- `calendar`
- valid [Unicode Calendar Identifier](https://cldr-smoke.unicode.org/spec/main/ldml/tr35.html#UnicodeCalendarIdentifier)
- `numberingSystem`
- valid [Unicode Number System Identifier](https://cldr-smoke.unicode.org/spec/main/ldml/tr35.html#UnicodeNumberSystemIdentifier)

> [!NOTE]
> These options do not have default values because they are only to be used
> These _options_ do not have default values because they are only to be used
> as overrides for locale-and-value dependent implementation-defined defaults.