SELECT DATEDIFF(HOUR,'2023-04-18 00:30:35',GETDATE())
      ,DATEPART(Minute,'2023-04-18 00:30:35') - DATEPART(Minute,GETDATE())
      ,DATEPART(Second,'2023-04-18 00:30:35') - DATEPART(Second,GETDATE())
      
      
      
      ,CONCAT(DATEDIFF(HOUR,'2023-04-18 00:30:35',GETDATE()),':'
      ,RIGHT(DATEPART(Minute,'2023-04-18 00:30:35') - DATEPART(Minute,GETDATE()),2),':'
      ,RIGHT(DATEPART(Second,'2023-04-18 00:30:35') - DATEPART(Second,GETDATE()),2))