Time variable

DECLARE @smalldatetime smalldatetime = '1955-12-13 12:43:10';
DECLARE @time time(4) = @smalldatetime;

SELECT @smalldatetime AS '@smalldatetime', @time AS 'time';

--Result
--@smalldatetime          time
------------------------- -------------
--1955-12-13 12:43:00     12:43:00.0000
--
--(1 row(s) affected)