"Scenario: DateTime Accuracy to One Second" fails sometimes

[chrislwade]

When run during the last 100ms of any given second, the following scenario fails:

Scenario: DateTime Accuracy to One Second
        Given I have a DateTime value
        And I have a second DateTime value that varies from the first by 100 milliseconds
        When I adjust the accuracy of each DateTime value to one second
        And I compare the first and second DateTime values
        Then the resulting difference should be zero

This fails because of the following:

// TimeExtensionSteps.cs:47
[Given(@"I have a DateTime value")]
public void CreateFirstDateTime()
{
    _context.FirstValue = DateTime.Now;
}

[Given(@"I have a second DateTime value that varies from the first by (.*) milliseconds")]
public void CreateSecondDateTime(int millisecondAdjustment)
{
    _context.SecondValue = _context.FirstValue.AddMilliseconds(millisecondAdjustment);
}

If DateTime.now's Millisecond property is in the range (900..999) and millisecondAdjustment is 100 or more, this test will fail.