Weird output in time routines

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VB

I was creating some very basic time routines to do some testing when I ended up with some very unexpected output.

My code was a simple console app:

Imports System.Threading

Module Module1
    Sub Main()
        Dim StartTime As DateTime
        Dim EndTime As DateTime

        For i As Integer = 1 To 10
            StartTime = DateTime.Now
            Thread.Sleep(5)
            EndTime = DateTime.Now
            Console.WriteLine(EndTime.Millisecond - StartTime.Millisecond)
        Next
        Console.ReadLine()
    End Sub
End Module

but the output was:

5
5
5
-995
5
5
5
5
5
5

The 5's (and even the occassional 6) were expected ... the -995 wasn't.

Can anyone explain what would have caused the system to generate that as an output?

Thanks.