is it possible to show dates with short format into graphs?
I need only YYYY-MM-DD.
Yes, but you’ll need to be using the latest version. From the question, go to settings, you’ll find all the formatting options in there.
You need the settings for the question, not global. You may need to create a new question too.
There’s still some minor bugs - even in the new version - but we have much more control since 0.31
Example, I select to show only date in abbreviated form, but it includes the day and time, and the date is in US-style on the hover: