ToSqlDateTimePrecision

// handy extension method to reduce a DateTime to the precision of a T-SQL DATETIME so that you can compare it with 
// CLR DateTime's in unit tests
public static partial class ExtensionMethods
{
    public static DateTime ToSqlDateTimePrecision(this DateTime source)
    {
        using (var ctx = new Data.DataContext())
        {
            return ctx.ExecuteQuery<DateTime>(string.Format("SELECT CONVERT(DATETIME, '{0}', 0)", source)).Single();
        }
    }
}