@sytexa/tzdb/dist/getUngroupedTimeZones.js

Always up to date list of time zones, with grouping and major cities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getUngroupedTimeZones;

var _timeZonesNames = _interopRequireDefault(require("../time-zones-names.json"));

var _timeZone = require("./utils/timeZone.js");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function getUngroupedTimeZones(opts) {
  const includeUtc = !!opts && opts.includeUtc;
  const baseZoneName = opts && opts.baseZone || "UTC";
  return _timeZonesNames.default.reduce(function (acc, timeZoneName) {
    const currentOffset = (0, _timeZone.getZoneOffset)(timeZoneName); // We build on the latest Node.js version, Node.js embed IANA databases
    // it might happen that the environment that will execute getTimeZones() will not know about some
    // timezones. So we ignore the timezone at runtim
    // See https://github.com/vvo/tzdb/issues/43

    if (currentOffset === false) {
      return acc;
    }

    const simpleZone = {
      name: timeZoneName,
      currentTimeOffsetInMinutes: currentOffset
    };
    acc.push({ ...simpleZone,
      currentTimeFormat: format(simpleZone, {
        baseZoneName
      })
    });
    return acc;
  }, includeUtc ? [utcTimezone] : []).sort((a, b) => {
    return compareNumbers(a, b) || compareStrings(a.name, b.name);
  });
}

function compareNumbers(x, y) {
  return x.currentTimeOffsetInMinutes - y.currentTimeOffsetInMinutes;
}

function compareStrings(x, y) {
  if (typeof x === "string" && typeof y === "string") {
    return x.localeCompare(y);
  }

  return 0;
}

function format({
  name,
  currentTimeOffsetInMinutes
}, {
  baseZoneName = "UTC"
}) {
  const offsetInHours = getOffsetHoursString(currentTimeOffsetInMinutes);
  return `(${baseZoneName} ${offsetInHours}) ${name.replace(/_/g, " ")}`;
}

function getOffsetHoursString(offsetInMinutes) {
  const absOffsetInMinutes = Math.abs(offsetInMinutes);
  const hours = absOffsetInMinutes / 60;
  return `${offsetInMinutes >= 0 ? "+" : "-"}${hours}`;
}

const utcTimezone = {
  name: "UTC",
  currentTimeOffsetInMinutes: 0,
  currentTimeFormat: "(UTC) Coordinated Universal Time"
};
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