Acme.BookStore.HttpApi.Host/node_modules/luxon/src/zones/IANAZone.js

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import { formatOffset, parseZoneInfo, isUndefined, ianaRegex, objToLocalTS } from "../impl/util.js";
import Zone from "../zone.js";

const matchingRegex = RegExp(`^${ianaRegex.source}$`);

let dtfCache = {};
function makeDTF(zone) {
  if (!dtfCache[zone]) {
    dtfCache[zone] = new Intl.DateTimeFormat("en-US", {
      hour12: false,
      timeZone: zone,
      year: "numeric",
      month: "2-digit",
      day: "2-digit",
      hour: "2-digit",
      minute: "2-digit",
      second: "2-digit"
    });
  }
  return dtfCache[zone];
}

const typeToPos = {
  year: 0,
  month: 1,
  day: 2,
  hour: 3,
  minute: 4,
  second: 5
};

function hackyOffset(dtf, date) {
  const formatted = dtf.format(date).replace(/\u200E/g, ""),
    parsed = /(\d+)\/(\d+)\/(\d+),? (\d+):(\d+):(\d+)/.exec(formatted),
    [, fMonth, fDay, fYear, fHour, fMinute, fSecond] = parsed;
  return [fYear, fMonth, fDay, fHour, fMinute, fSecond];
}

function partsOffset(dtf, date) {
  const formatted = dtf.formatToParts(date),
    filled = [];
  for (let i = 0; i < formatted.length; i++) {
    const { type, value } = formatted[i],
      pos = typeToPos[type];

    if (!isUndefined(pos)) {
      filled[pos] = parseInt(value, 10);
    }
  }
  return filled;
}

let ianaZoneCache = {};
/**
 * A zone identified by an IANA identifier, like America/New_York
 * @implements {Zone}
 */
export default class IANAZone extends Zone {
  /**
   * @param {string} name - Zone name