I have two files with below formats:

file1: 

```
Sub_amount , date/time

12  ,    2018040412   
78  ,    2018040413   
26  ,    2018040414

```

file2: 

```
Unsub_amount , date/time   
76     , 2018040412   
98     , 2018040413   
56     , 2018040414   

```

what I need is, append file2 to file1 from right. what I mean is:

```
Sub_amount, Unsub_amount , date/time   
12      ,       76      , 2018040412    
78       ,       98      , 2018040413   
26       ,       56      , 2018040414   

```

At the end, what is needed to be shown is: 

```
date/time , Unsub_amount , Sub_amount  
2018040412, 76 , 12  
2018040413, 98 , 78  
2018040414, 26 , 56

```

I would be appreciate if anyone can support :)
Thanks.