Function getLocaleExtraDayPeriodRules

packages/common/src/i18n/locale_data_api.ts:640–650

(locale: string)

 * Let `Intl.DateTimeFormat` determine the day period instead.
 */
export function getLocaleExtraDayPeriodRules(locale: string): (Time | [Time, Time])[] {
  const data = ɵfindLocaleData(locale);
  checkFullData(data);
  const rules = data[ɵLocaleDataIndex.ExtraData][ɵExtraLocaleDataIndex.ExtraDayPeriodsRules] || [];
  return rules.map((rule: string | [string, string]) => {
    if (typeof rule === 'string') {
      return extractTime(rule);
    }
    return [extractTime(rule[0]), extractTime(rule[1])];
  });
}

/**
 * Retrieves locale-specific day periods, which indicate roughly how a day is broken up