Problem with taxonomy and query_posts in custom post type

Hi,

I have a problem with query_posts() with taxonomy.

I have Custom Post ‘koncerty’. I create taxonomy for this custom post:
– miejsce //means PLACE
– datakoncertu //means date od event format ex. 2017-01-01
– adres // means address
– godzina // measn hour of event

I put on my template query like:

query_posts(array( 
        'post_type' => 'koncerty',
	'tax_name' => 'datakoncertu',
	'orderby'   => 'tax',
	'ordertax'	=> 'DESC',
	)
); 

Posts are displayed by not order by taxonomy.
Could you tell me how can I create query to show posts from post type “koncerty” and sort by taxonomy “datakoncertu” (it’s date od event)??

I have a lot of date in taxonomy “datakoncertu”. I need to sort by only this taxonomy from older to newest (DESC)

Thank You