docs: function getLocaleExtraDayPeriodRules(locale) {
      var data = findLocaleData(locale);
      checkFullData(data);
      var rules = data[19 /* ExtraData */][2 /* ExtraDayPeriodsRules */] || [];
      return rules.map(function (rule) {
          if (typeof rule === 'string') {
              return extractTime(rule);
          }
          return [extractTime(rule[0]), extractTime(rule[1])];
      });
  }