SQL Server datetime rounding

Question

According to MSDN "Rounding of datetime Fractional Second Precision" it should truncate the following Date when saving into a datetime column:

new DateTime(635180453197748530L)  //22 October 2013 13:28:39.7748530
// write to SQL server and re-read it
// result should be = 6351804531977 3 0000L

However, it is reproducible 6351804531977 7 0000L. Is this a bug or do I have any problems in my understanding of the algorithm?

(we use Entity Framework for read/write to DB)

Answer 1

Sometimes before I write a datetime to the database, I cast it to SqlDateTime, which I have found produces much more predictable results with regards to rounding/truncation than simply writing the CLR datatype to the database directly.