moment.js - isBetween() 方法不能始终如一地工作

Question

我有一个运行良好的 moment.js 代码：

var startDate = '2015-05-06T19:00:00+0300';
moment(startDate).isBetween(moment(), moment().add(30, 'days'));
// returns true, that's great!

但是当我开始重构以使其更具可读性时，它无法工作：

var today = moment();
var startDate = '2015-05-06T19:00:00+0300'; 
moment(startDate).isBetween(today, today.add(30, 'days'));
// returns false.. but why?

Answer 1

var today = moment();
var startDate = '2015-05-06T19:00:00+0300'; 
moment(startDate).isBetween(today, moment(today).add(30, 'days')); 

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