Add Date of Visit to custom segments

Hi,

My new site gets usually 10 to 40 visitors per day.
But I found an old account from a traffic exchange website and spent the points and received therefore 10,000 visitors in 3 days.

Now my charts look like this:
[attachment 2037 chart.png]

Therefore I would like to have the chance to filter the reports and hide the visitors from the specific dates.