function CanonicalizeTimeZoneName(tz, _a) {
        var tzData = _a.tzData, uppercaseLinks = _a.uppercaseLinks;
        var uppercasedTz = tz.toUpperCase();
        var uppercasedZones = Object.keys(tzData).reduce(function (all, z) {
            all[z.toUpperCase()] = z;
            return all;
        }, {});
        var ianaTimeZone = uppercaseLinks[uppercasedTz] || uppercasedZones[uppercasedTz];
        if (ianaTimeZone === 'Etc/UTC' || ianaTimeZone === 'Etc/GMT') {
            return 'UTC';
        }
        return ianaTimeZone;
    }
https://tc39.es/ecma402/#sec-canonicalizetimezonename
@param tz