State-info on card

In a couple of screenshots I see a ‘last updated’ text underneath the switch
Example in the screenshot at this link https://home-assistant.io/developers/frontend_add_card/

How do I get this?
I believe it has to do with the polymer front end and this file https://github.com/home-assistant/home-assistant-polymer/blob/master/src/components/entity/state-info.html

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I’ve been wondering about this myself. Just like you, I’ve seen it in screenshots but never in my own UI.

That screenshots are from previous versions of HA. The ... minutes ago was removed from the main UI.