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Normative: Change the hourCycle default logic #758

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Sep 27, 2023
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13 changes: 9 additions & 4 deletions spec/datetimeformat.html
Original file line number Diff line number Diff line change
Expand Up @@ -76,15 +76,14 @@ <h1>InitializeDateTimeFormat ( _dateTimeFormat_, _locales_, _options_ )</h1>
1. Set _dateTimeFormat_.[[NumberingSystem]] to _r_.[[nu]].
1. Let _dataLocale_ be _r_.[[dataLocale]].
1. Let _dataLocaleData_ be _localeData_.[[&lt;_dataLocale_&gt;]].
1. Let _hcDefault_ be _dataLocaleData_.[[hourCycle]].
1. If _hour12_ is *true*, then
1. If _hcDefault_ is *"h11"* or *"h23"*, let _hc_ be *"h11"*. Otherwise, let _hc_ be *"h12"*.
1. Let _hc_ be _dataLocaleData_.[[hourCycle12]].
1. Else if _hour12_ is *false*, then
1. If _hcDefault_ is *"h11"* or *"h23"*, let _hc_ be *"h23"*. Otherwise, let _hc_ be *"h24"*.
1. Let _hc_ be _dataLocaleData_.[[hourCycle24]].
1. Else,
1. Assert: _hour12_ is *undefined*.
1. Let _hc_ be _r_.[[hc]].
1. If _hc_ is *null*, set _hc_ to _hcDefault_.
1. If _hc_ is *null*, set _hc_ to _dataLocaleData_.[[hourCycle]].
1. Set _dateTimeFormat_.[[HourCycle]] to _hc_.
1. Let _timeZone_ be ? Get(_options_, *"timeZone"*).
1. If _timeZone_ is *undefined*, then
Expand Down Expand Up @@ -205,6 +204,12 @@ <h1>Internal slots</h1>
<li>
[[LocaleData]].[[&lt;_locale_&gt;]].[[hourCycle]] must be a String value equal to *"h11"*, *"h12"*, *"h23"*, or *"h24"*.
</li>
<li>
[[LocaleData]].[[&lt;_locale_&gt;]].[[hourCycle12]] must be a String value equal to *"h11"* or *"h12"*.
</li>
<li>
[[LocaleData]].[[&lt;_locale_&gt;]].[[hourCycle24]] must be a String value equal to *"h23"* or *"h24"*.
</li>
<li>
[[LocaleData]].[[&lt;_locale_&gt;]] must have a [[formats]] field. This [[formats]] field must be a Record with [[&lt;_calendar_&gt;]] fields for all calendar values _calendar_. The value of this field must be a list of records, each of which has a subset of the fields shown in <emu-xref href="#table-datetimeformat-components"></emu-xref>, where each field must have one of the values specified for the field in <emu-xref href="#table-datetimeformat-components"></emu-xref>. Multiple records in a list may use the same subset of the fields as long as they have different values for the fields. The following subsets must be available for each locale:
<ul>
Expand Down
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