Ignore milliseconds when comparing two datetimes

Question

This is probably a dumb question, but I cannot seem to figure it out. I am comparing the LastWriteTime of two files, however it is always failing because the file I download

Answer 1

TimeSpan difference = dtNew - dtOrig;
if (difference >= TimeSpan.FromSeconds(1))
{
    ...
}

Answer 2

Create a new DateTime value with the milliseconds component set to 0:

dt = dt.AddMilliseconds(-dt.Millisecond);