Time Between SQL Query

Question

Need to put in my code time beetwen 05:59:59 to 21:59:59

In line 4 and 5

 

 Datetime format columns vrijemeprijave and vrijemeodjave are 2019-12-31 09:38:23.917

SELECT radnik as 'Radnik',
SUM(CASE WHEN DATEPART(WEEKDAY,vrijemeprijave) in (5, 6) then 0 else DATEPART(HOUR,vrijemeprijave)END) as 'Prijava',
SUM(CASE WHEN DATEPART(WEEKDAY,vrijemeodjave) in (5, 6) then 0 else DATEPART(HOUR,vrijemeodjave)END) as 'Odjava',
ISNULL(SUM(CASE WHEN DATEPART(WEEKDAY, vrijemeprijave) in (1,7) then 0 else (CASE WHEN (DATEDIFF(SECOND, vrijemeprijave, vrijemeodjave) / 3600) > 8 THEN 8 ELSE(DATEDIFF(SECOND, vrijemeprijave, vrijemeodjave) / 3600) END)END),0) AS 'Radni sati',
ISNULL(SUM(CASE WHEN DATEPART(WEEKDAY, vrijemeprijave) in (1,7) then 0 else (CASE WHEN (DATEDIFF(SECOND, vrijemeprijave, vrijemeodjave) / 3600) > 8 THEN 8 ELSE(DATEDIFF(SECOND, vrijemeprijave, vrijemeodjave) / 3600) END)END),0) AS 'Nocni'
FROM dbo.prijava_radnika
where radnik='Bibic Goran' AND day(vrijemePrijave) = 24 and MONTH(vrijemePrijave) ='12' AND YEAR(vrijemePrijave) = '2019'
GROUP BY radnik, IdPrijava, vrijemeprijave, vrijemeodjave

Result now is :

Radnik           Prijava      Odjava            Radni sati      Nocni
Bibic Goran        22            6                 8              8

Need to be with new code:

Radnik           Prijava      Odjava            Radni sati      Nocni
Bibic Goran        22            6                 0              8