moment.js - isBetween（）方法不工作始終

Question

我有一個moment.js代碼，效果很好：

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

但是當我開始重構，以使其更具可讀性它無法工作：

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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