Table Timestamp Format not working on version 0.18.5

[Visitante]

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.18.5

Expected results

Table Timestamp Format should be converting dates to appropriate format.

Actual results

Date is kept on timestamp format. Ex: 1499794560000

Steps to reproduce

Create a new slice using a datetime column. The datetime column is shown as timestamp even with formating.
There is no errors on the logs or stacktrace.

[xrmx]

Dup of #3027? If so please close.

[umesh11111]

Any update on the above issue,even i am facing the same issue in .34 version,i could not able to use the dropdown value