Question : T-SQL:update only time in a date field from another column value

I need the code to update a dates column time without changing the date.
The required time is stored in another column in small date time data type.

I got the below code from MSDN(it works) but am spending too much time trying to edit the code to fit my requirement.

How can i set the @d1 to equal the date field i want to change and @t1 as the new date. 
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use map
declare @d1 datetime
declare @t1 datetime

set @d1 = '1/2/1934 03:14:18.000'
set @t1 = '1/2/1934 03:14:18.000'

declare @dCombo datetime
set @dCombo = DateAdd(dd, DateDiff(dd, @t1, @d1), @t1)

SELECT @dCombo

Answer : T-SQL:update only time in a date field from another column value

UPDATE yourtable
   SET your_date_field = DateAdd(dd, DateDiff(dd, STARTTIME, your_date_field ), STARTTIME)
WHERE ...
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