calculate difference in milli seconds

calculating date difference using datediff in milliseconds is limited (For milliseconds, the maximum number is 24 days, 20 hours, 31 minutes and 23.647 seconds.).
the constraint is its return type INT.

Is there any other way to find out the diff in millisencods(no manual calculation plz..)

thanks in adv
-Chandra
mcprakash4uAsked:
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HilaireCommented:
declare @d1 datetime, @d2 datetime
set @d1 = getdate()
set @d2 = dateadd(hour, 5, getdate()+25) -- 25 days and 5 hours later


select cast(datediff(day, @d1, @d2) as bigint) * 86400000 +
 datediff(millisecond, dateadd(day, datediff(day, @d1, @d2), @d1), @d2) as datediff_ms
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HilaireCommented:
You can make it a user-defined function as follows

create function ufn_datediff_ms(@d1 datetime, @d2 datetime)
returns bigint as
begin
    return cast(datediff(day, @d1, @d2) as bigint) * 86400000 +
 datediff(millisecond, dateadd(day, datediff(day, @d1, @d2), @d1), @d2)
end
go

-- how to use it (don't omit the dbo/owner prefix)
select dbo.ufn_datediff_ms('2004.01.01', '2004.01.26') as diff_in_ms

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HilaireCommented:
The idea is to
- use bigint as return datatype
- calculate the difference in days and multiply by nb of millisecs in a day (1)
- calculate the diff in ms on the hours alone for the same day (reduce day offset) (2)
- add (1) and (2)
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mcprakash4uAuthor Commented:
this is as good as

return datediff(ss, @d1,@d2)*1000

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RichardCorrieCommented:
Bear in mind that the Datetime field in SQL only holds time to "accuracy of one three-hundredth of a second (equivalent to 3.33 milliseconds or 0.00333 seconds). " (from BOL)

/Richard

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HilaireCommented:
>>this is as good as
return datediff(ss, @d1,@d2)*1000
<<
Not exactly the same though
Yours rounds the results at the second
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