To set date format we will need dconf-editor tool, standart features doesn't support custom format.

Setting up:

$ sudo apt install dconf-tools

and start tool:

$ dconf-editor

Find path in tree: com -> canonical -> indicator -> datetime and change params:

custom-time-format: %Y-%m-%d %H-%M
time-format: custom

That's it. Now we have custom formated date in applet like 2016-07-25 15:31.

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