function FormatDateTime(dtf, x, implDetails) {
        var parts = PartitionDateTimePattern(dtf, x, implDetails);
        var result = '';
        for (var _i = 0, parts_1 = parts; _i < parts_1.length; _i++) {
            var part = parts_1[_i];
            result += part.value;
        }
        return result;
    }
https://tc39.es/ecma402/#sec-formatdatetime
@param dtf DateTimeFormat
@param x