Github user tae-jun commented on the issue:

    https://github.com/apache/zeppelin/pull/1730
  
    @AhyoungRyu Always thanks for your nice review 😄 
    
    Yes, it's intended. A time stamp is generated only if a `folder` already 
exists in the trash. But it's not generated when moving a `note` to the trash.
    
    I made this feature because of a **use case** like this:
    ### A use case needs time stamp
    1. A user moves "NoteDirA" folder to the trash
    2. And the user create a folder which has the same name ("NoteDirA")
    3. After a month from then, the user forgot the existence of the folder 
already exists in the trash, and moves the folder to the trash which created 
later
    4. But it was a mistake and the user wants to restore the folder created 
later
    
    ### Necessity of the time stamp for the use case above
    
    **If there is no time stamp:**
    The folder created later will be merged into old one and the folder 
"NoteDirA" will be messy.
    
    #### If there is a time stamp:
    The folder created later will be moved to the trash with a time stamp 
postfix. There will be two folders which are "NoteDirA" (old one) and "NoteDirA 
removed at 2016-12-14 xx:xx:xx" (new one). In this case, the user can restore 
the folder successfully.
    
    This is why I added time stamp! :-) Please tell me if there is any other 
idea.
    
    ### Remove permanently icon candidates (?)
    I agree with you so I searched Font Awesome and found some candidates for 
the icon. I think not only `empty trash` but also `Remove note permanently` and 
`Remove folder permanently` should be replaced together. 
    
    
![image](https://cloud.githubusercontent.com/assets/8201019/21180874/543a32b0-c23e-11e6-9f5f-25a0fa25bb84.png)
    
![image](https://cloud.githubusercontent.com/assets/8201019/21180952/c8ce421a-c23e-11e6-9297-f7df93a36ef5.png)
    
![image](https://cloud.githubusercontent.com/assets/8201019/21180965/e9a051ea-c23e-11e6-96b8-7df5469a87cf.png)
    
![image](https://cloud.githubusercontent.com/assets/8201019/21181004/179fe736-c23f-11e6-9e58-36ade60959c4.png)
    
    The icons above are the candidates I found, but please let me know if you 
have a better one!
    
    Which icon do you prefer? 😄
    
    Thanks for the review again 👍 


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