[ JS 常見問題 ] Time difference in Nodejs?

Source From Here 
Question 
Im trying to figure out a way to get the time difference in seconds between two dates. For example, difference in seconds between: 

Start 2013-5-11 8:37:18 
End 2013-5-11 10:37:18

How-To 
You can leverage moment module: 

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1. var moment = require('moment')  
2. var startDate = moment('2013-5-11 8:37:18', 'YYYY-M-DD HH:mm:ss')  
3. var endDate = moment('2013-5-11 10:37:18', 'YYYY-M-DD HH:mm:ss')  
4. var secondsDiff = endDate.diff(startDate, 'seconds')  
5. console.log(secondsDiff) // Output 7200  

More usage on moment module: 

> st = moment() 
moment("2019-02-19T19:06:46.633") 
> et = moment() 
moment("2019-02-19T19:06:52.655") 
> et.diff(st, 'seconds') 
6 
> var now = new Date() 
> now 
2019-02-19T11:07:25.880Z 
> now_in_moment = moment(now) // Transform Date object into moment object 
moment("2019-02-19T19:07:25.880") 
> var now_as_date = now_in_moment.toDate() // Transform moment object back to Date object 
> now_as_date 
2019-02-19T11:07:25.880Z 
> now_as_date.constructor.name 
'Date'

Supplement 
* FAQ - How to format a JavaScript date 
* FAQ - Moment.js transform to date object 
* W3CSchool - JavaScript Date Reference 
* npm - moment: A lightweight JavaScript date librar...ulating, and formatting dates. 

# npm install -S moment