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Normative: Call RegionPreference in WeekInfoOfLocale #1051

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gibson042 merged 3 commits into from
Jul 22, 2026
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Normative: Call RegionPreference in WeekInfoOfLocale #1051

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Normative: Call RegionPreference in WeekInfoOfLocale
anba Apr 9, 2026
5076045
fixup! Normative: Call RegionPreference in WeekInfoOfLocale
gibson042 Jul 22, 2026
61406b4
fixup! Normative: Call RegionPreference in WeekInfoOfLocale
gibson042 Jul 22, 2026
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10 changes: 8 additions & 2 deletions spec/locale.html
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Expand Up @@ -871,8 +871,14 @@ <h1>
<dd>The following algorithm refers to Locale data specified in <a href="https://www.unicode.org/reports/tr35/tr35-dates.html#Date_Patterns_Week_Elements">Unicode Technical Standard #35 Part 4 Dates, Week Elements</a>.</dd>
</dl>
<emu-alg>
1. Let _locale_ be _loc_.[[Locale]].
1. Let _weekInfo_ be a Record whose fields are defined by <emu-xref href="#table-locale-weekinfo-record"></emu-xref>, with values based on _locale_.
1. Let _preference_ be RegionPreference(_loc_.[[Locale]]).
1. Let _region_ be _preference_.[[Region]].
1. Let _regionOverride_ be _preference_.[[RegionOverride]].
1. If _regionOverride_ is not *undefined* and week data for _regionOverride_ are available, then
1. Let _lookupRegion_ be _regionOverride_.
1. Else,
1. Let _lookupRegion_ be _region_.
1. Let _weekInfo_ be a Record whose fields are defined by <emu-xref href="#table-locale-weekinfo-record"></emu-xref>, with values based on _lookupRegion_. If no week data for _lookupRegion_ is available, the week data for region *"001"* is used.
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1. Let _firstDayString_ be _loc_.[[FirstDayOfWeek]].
1. If _firstDayString_ is not *undefined*, then
1. Let _firstDay_ be WeekdayUValueToNumber(_firstDayString_).
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