[ JS 常見問題 ] Javascript Date output formatting

Source From Here 
Question 
I need to capture the Now() date and time in the YYYY/mm/dd hh:m:sec format. It needs to be in GMT time. How do I achieve that with Javascript? 

How-To 
You can build it manually: 
- test.js 

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1. function getUTCStr(){  
2.     var t = new Date();  
3.     var dateStr = t.getUTCFullYear() + '/' + ("0" + (t.getUTCMonth() + 1)).slice(-2) + '/' + ("0" + (t.getUTCDate() + 1)).slice(-2) + ' ' +  
4.                   ("0" + (t.getUTCHours() + 1)).slice(-2) + ':' +  
5.                   ("0" + (t.getUTCMinutes() + 1)).slice(-2) + ':' +  
6.                   ("0" + (t.getUTCSeconds() + 1)).slice(-2);  
7.   
8.     return dateStr  
9. }  
10.   
11. function getTimeStr(){  
12.     var t = new Date();  
13.     var dateStr = t.getFullYear() + '/' + ("0" + (t.getMonth() + 1)).slice(-2) + '/' + ("0" + (t.getDate() + 1)).slice(-2) + ' ' +  
14.                   ("0" + (t.getHours() + 1)).slice(-2) + ':' +  
15.                   ("0" + (t.getMinutes() + 1)).slice(-2) + ':' +  
16.                   ("0" + (t.getSeconds() + 1)).slice(-2);  
17.   
18.     return dateStr  
19. }  
20.   
21. exports.getUTCStr = getUTCStr  
22. exports.getTimeStr = getTimeStr  

Then you can use those two functions this way: 

> t = require('./test')
{ getUTCStr: [Function: getUTCStr],
getTimeStr: [Function: getTimeStr] }

> t.getUTCStr()
'2018/08/14 10:39:41'
> t.getTimeStr()
'2018/08/14 18:39:46' // My timezone is +8

Supplement 
* MDN - String.prototype.slice() 
* MDN - Date object