Using Max to return largest Epoch date for a column inside DateAdd function

Question

I am trying to build a query that returns the "last date" associated with a specific user.  The "last date" is listed in the table as epoch time and I am attempting to convert the epoch time using DateAdd().  The statement below
generates an Arithmetic overflow error when the statement is executed.
select top 1 (select dateadd(s, (select max(dbo.history.action_created_date)as action_created_date), 19700101)
from dbo.history where dbo.history.ActionTakenBy like 'Nathan%') as MaxDate, dbo.history.act_name, dbo.history.ActionTakenDateText
from dbo.history
where dbo.history.ActionTakenBy like 'Nathan%';

Answer 1

you can simpy do this instead
select dateadd(s, action_created_date, '19700101 00:00:00.000') as MaxDate,act_name,ActionTakenDateText
FROM
select dbo.history.act_name, dbo.history.ActionTakenDateText,
dbo.history.ActionTakenBy,
ROW_NUMBER() OVER (PARTITION BY dbo.history.ActionTakenBy ORDER BY dbo.history.action_created_date DESC) AS Seq
from dbo.history
)t
where ActionTakenBy like 'Nathan%'
AND Seq=1;
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