我不太确定自己在做什么错，但是我的日期是从我在UTC的服务器返回的
2018-08-28T16:44:24.3900212Z
const utcNow = moment.utc(); // _Tue Aug 28 2018 09:39:43 GMT-0700
const expirationDate = moment.utc("2018-08-28T16:44:24.3900212Z");
const d = expirationDate.diff(utcNow, 'minutes'); // I get like 42 mins when I expect around 3-5 mins.