HH:MM:SS:Msec to HH:MM:SS in stored procedure

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SQL-Server

I have a stored procedure which update a table based on such calculation and the calculation is done as Column Name (Calendatedate) -( Current System Date Time) and update this information to a column (TimeSpent) and display the value in Hh:Mm:SS:Msec Format. The Query is working fine but i want to update it in such a way so that the Time spent should be only HH:MM:SS Format.Please help me that how i remove that Msec From the time Spent.

CREATE procedure St_Proc_UpdateTimeSpent        
@timeEntryID int,        
@status int output        
as begin         
set nocount on;        
declare @Date dateTime;        
set @Date=GETDATE(); 
	update Production set TimeSpent=(SELECT CONVERT(VARCHAR(20),DateAdd(SS,Datediff(ss,CalendarDate, @Date)%(60*60*24),0),114)),  
	IsTaskCompleted=1       
	where productionTimeEntryID=@timeEntryID         
	set @status=1;        
	return @status;        
end