sql server date time convert to hours date to make charts date

ps.sql

CREATE PROCEDURE "SP_Statistique_UmsatzbyTime"(
	@dateStart DATE,
	@dateFin DATE
)

AS
BEGIN

SELECT 
		 Concat(DATEPART(hh ,stardate ),':00')  AS Hours ,
		  FORMAT(sum(ISNULL(wr.sales, 0 )+ISNULL(wr.sales2, 0 )+ISNULL(wr.costt, 0 )) ,'N2') as umsatz

 FROM iso.works wr WHERE
	TRY_CONVERT(DATE, stardate) >= @dateStart AND TRY_CONVERT(DATE, stardate) <= @dateFin
	GROUP BY DATEPART(hh , stardate ) 
	ORDER BY CASE when DATEPART(hh , stardate ) >= 6 then 0 ELSE 1 END ASC , DATEPART(hh , stardate ) ASC

END