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In SQL Server 2008, why do the following queries return the same value?
-- These all return 2011-01-01 23:59:59.997
SELECT CAST('2011-01-01 23:59:59.997' as datetime)
SELECT CAST('2011-01-01 23:59:59.998' as datetime)
And why does the following query round to the next day?
-- Returns 2011-01-02 00:00:00.000
SELECT CAST('2011-01-01 23:59:59.999' as datetime)
The accuracy of DateTime within SQL Server has always been to 1/300s of a second (3.33ms), so any value that does not divide precisely gets rounded.
To get additional accuracy, there is the DateTime2 data type, available in SQL Server 2008 onwards, that can be accurate to 7 decimal places.