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[TF-969] Adding map from IANA timezones to Windows Timezones #1

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[TF-969] Adding map from IANA timezones to Windows Timezones #1

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16 changes: 15 additions & 1 deletion __tests__/index.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { findIana, findOneIana } from "../src";
import { findIana, findOneIana, findWindows } from "../src";

describe("findOneIana()", () => {
test("returns a IANA time zone when passed just a Windows time zone name", () => {
Expand Down Expand Up @@ -63,3 +63,17 @@ describe("findIana()", () => {
expect(findIana("US Mountain Standard Time", "fake")).toBeUndefined();
});
});

describe("findWindows()", () => {
test("returns a Windows time zone when a IANA timezone is passed", () => {
expect(findWindows("Etc/GMT+11")).toBe("UTC-11");
expect(findWindows("America/Phoenix")).toBe("US Mountain Standard Time");
expect(findWindows("America/Chicago")).toBe("Central Standard Time");
expect(findWindows("Europe/Berlin")).toBe("W. Europe Standard Time");
expect(findWindows("Asia/Shanghai")).toBe("China Standard Time");
});

test("returns `undefined` if the IANA timezone cannot be converted", () => {
expect(findWindows("fake time zone")).toBeUndefined();
});
});
7 changes: 6 additions & 1 deletion src/index.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import map, { ZoneMap } from "./time-zone-map";
import map from "./time-zone-map";

export const findIana = (windowsTimeZone: string, territory: string = "001"): string[] | undefined => {
const entry = map.find(
Expand All @@ -16,3 +16,8 @@ export const findOneIana = (windowsTimeZone: string, territory: string = "001"):
if (typeof result === "undefined") return undefined;
return result[0];
};

export const findWindows = (ianaTimeZone: string): string | undefined => {
const entry = map.find(({ iana }) => iana.indexOf(ianaTimeZone) > -1);
return entry && entry.windowsName;
};