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I have the following query :
select CONVERT(varchar(12), DATEADD(MILLISECOND, DateDiff(MILLISECOND, '2014-08-04 10:37:28.713','2014-11-04 08:21:17.723'), 0), 114) When I execute this, I get the error : "The datediff function resulted in an overflow. The number of dateparts separating two date/time instances is too large. Try to use datediff with a less precise datepart."
When I change the query to the following it works fine :
select CONVERT(varchar(12), DATEADD(SECOND, DateDiff(SECOND, '2014-08-04 10:37:28.713','2014-11-04 08:21:17.723'), 0), 114) The problem is that I really need the MILLISECONDS as well.
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The DATEDIFF() function returns the difference between two dates.
The DATEDIFF() function returns an integer value that represents the difference between the start date and end date, with the date part as the unit. If the result is out of range for the integer (-2,147,483,647), the DATEDIFF() function returns an error. Here, the DATEDIFF BIG() function should be used instead.
The reason DATEDIFF() runs slow is that using it takes a bit of time to perform the calculation, the query optimizer is (probably) ending up running it for the entire table, and there is (probably) no index to help it select the required rows.
To calculate the difference between the arrival and the departure in T-SQL, use the DATEDIFF(datepart, startdate, enddate) function. The datepart argument can be microsecond , second , minute , hour , day , week , month , quarter , or year . Here, you'd like to get the difference in seconds, so choose second.
A bit later response but may help. In SQL 2016 MS introduced function DATEDIFF_BIG which will (according to type size) overflow in difference bigger than something like 290k years. But technet article have same time difference as basic DATEDIFF - https://msdn.microsoft.com/en-us/library/mt628058.aspx
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See https://docs.microsoft.com/en-us/sql/t-sql/functions/datediff-transact-sql?view=sql-server-ver15#return-value
For millisecond, the maximum difference between startdate and enddate is 24 days, 20 hours, 31 minutes and 23.647 seconds.
If you need millisecond above that level, you'll need to write something custom.
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