37 lines
1.3 KiB
JavaScript
37 lines
1.3 KiB
JavaScript
/**
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* @private
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*/
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import Zone from "../zone.js";
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import IANAZone from "../zones/IANAZone.js";
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import FixedOffsetZone from "../zones/fixedOffsetZone.js";
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import InvalidZone from "../zones/invalidZone.js";
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import { isUndefined, isString, isNumber } from "./util.js";
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export function normalizeZone(input, defaultZone) {
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let offset;
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if (isUndefined(input) || input === null) {
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return defaultZone;
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} else if (input instanceof Zone) {
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return input;
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} else if (isString(input)) {
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const lowered = input.toLowerCase();
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if (lowered === "local") return defaultZone;
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else if (lowered === "utc" || lowered === "gmt") return FixedOffsetZone.utcInstance;
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else if ((offset = IANAZone.parseGMTOffset(input)) != null) {
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// handle Etc/GMT-4, which V8 chokes on
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return FixedOffsetZone.instance(offset);
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} else if (IANAZone.isValidSpecifier(lowered)) return IANAZone.create(input);
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else return FixedOffsetZone.parseSpecifier(lowered) || new InvalidZone(input);
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} else if (isNumber(input)) {
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return FixedOffsetZone.instance(input);
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} else if (typeof input === "object" && input.offset && typeof input.offset === "number") {
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// This is dumb, but the instanceof check above doesn't seem to really work
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// so we're duck checking it
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return input;
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} else {
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return new InvalidZone(input);
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}
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}
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