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@burglekitt/gmt

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Temporal-based date and time utilities with timezone support and polyfill integration

github.com/burglekitt/gmt

burglekitt/gmt

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/** * Resolve the ISO day-of-week number (1 = Monday .. 7 = Sunday) that a * locale considers the first day of the week, via * `Intl.Locale.prototype.weekInfo`. * * - Returns `null` if `locale` is not a valid BCP 47 tag. * - Falls back to `1` (Monday, matching GMT's existing ISO default in * `startOfDate`/`startOfZoned`) if `weekInfo` is unavailable on the * runtime (older engines) or unresolvable for the given locale. */ export declare function getLocaleFirstDayOfWeek(locale: string): number | null;