Since SQL Server stores time as a full datetime value, I use this script to return just the time part formatted as hh:mm:ss.
Usage:
Select mydb.dbo.udfHHMMSS(Getdate())
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[udfHHMMSS]')
and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[udfHHMMSS]
GO
CREATE FUNCTION dbo.udfHHMMSS (@dttm DATETIME)
RETURNS nvarchar(8)
AS
BEGIN
Declare @udfHHMMSS nvarchar(8)
SELECT @udfHHMMSS = RIGHT('0' + CAST(DATEPART(hh,@dttm) AS Varchar(2)), 2) + ':' + RIGHT('0' + CAST(DATEPART(mi,@dttm) AS Varchar(2)), 2) + ':' + RIGHT('0' + CAST(DATEPART(ss,@dttm) AS Varchar(2)), 2)
RETURN(@udfHHMMSS)
END
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO 
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