尝试类似的方法。注意：我在这里不是毫秒级

  declare @dt datetime = getdate（）
clarify @t time =' 01:35:45'

选择dateadd（second，
 datepart（hour，@ t）* 3600 + 
 datepart（minute，@ t）* 60 + 
 datepart（second，@ t），
 @dt）
 

I have to add time value to existing datetime value using T-SQL in SQL Server 2012.

I was thinking that DATEADD function it might be a solution, but it is not...

Perhaps I have somehow time convert to datetime?

So I have

StartDate 2013-02-18 18:34:40.330 (datetime)

Interval 00:11:00.0000000 (time)

EndDate ? tsql ? (datetime)

Any clue?

Try something like this. Note: I am not taking milliseconds here

declare @dt datetime = getdate()
declare @t time = '01:35:45'

select dateadd(second, 
                  datepart(hour,@t) * 3600 + 
                  datepart(minute,@t) * 60 + 
                  datepart(second,@t),
                  @dt)