Operacje na timezone UTC w moment.js

moment.tz.setDefault('UTC');
console.log(moment.utc('2019-10-17 17:01:01').utcOffset('+0100').format('YYYY-MM-DD HH:mm:ss'));
console.log(window.utcOffsetValue);
console.log(moment().utcOffset(window.utcOffsetValue).format('YYYY-MM-DD HH:mm:ss'));