DateTime to hh:mm:ss

CREATE FUNCTION BP_Select_HHMMSS(@DateTime DATETIME)
RETURNS VARCHAR(50)
AS
BEGIN
	
	DECLARE @RetVal VARCHAR(50)
	
	DECLARE @hh varchar(3),@mi varchar(3),@ss varchar(3)
	select @hh=datepart(hh,@DateTime)
	select @mi=datepart(mi,@DateTime)
	select @ss=datepart(ss,@DateTime)
	if(len(@hh)<2)
		set @hh='0'+@hh
	if(len(@mi)<2)
		set @mi='0'+@mi
	if(len(@ss)<2)
		set @ss='0'+@ss
	select @RetVal= @hh + ':'+ @mi + ':' + @ss

		
RETURN(@RetVal)
END