How to convert a unix timestamp column into date format(yyyy-MM-dd) ?

[Devi P.V]

Hi all,

I have a dataframe like following,

+------------------------------------+---------------+
|client_id                           |timestamp|
+------------------------------------+---------------+
|cd646551-fceb-4166-acbc-b9|1477989416803  |
|3bc61951-0f49-43bf-9848-b2|1477983725292  |
|688acc61-753f-4a33-a034-bc|1479899459947  |
|5ff1eb6c-14ec-4716-9798-00|1479901374026  |
+------------------------------------+---------------+

 I want to convert timestamp column into yyyy-MM-dd format.
How to do this?


Thanks