Problem with parameter in register route method

Hi,
I have problem with register_routes(): I have to do a query to get some thing but I don’t manage to pass a date to my function.

This is my route registration:

register_rest_route( $this->namespace, '/' . $this->rest_base . '/todayEvents', array(
		array(
		'methods'         => WP_REST_Server::READABLE,
		'callback'        => array( $this, 'getTodayEvents' ),
		'args'            => array(
							 'posts_per_page'     => 4,
							 'offset'     => 1,
							 'filter'     => date("Y-m-d")
							),
		),
		'schema'          => array( $this, 'get_public_item_schema' ),
		) );

In getTodayEvents($request) method I need to retrieve the date passed but I don’t know how.

In my function
$dateFilter = $request[‘filter’];

$dateFilter is empty.

I need to use the same function and passing different params because I have to filter my results by different date, so I think it’s better to use a generic function and passing different arguments.

Thank you

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