Burndown chart after Sprint Planning

Question

We just began using Visual Studio Online to help us manage our sprints.

Our sprint started today, the 27th Jan. We had our Sprint Planning in the morning, where we committed backlog items to our sprint.

The burndown chart looked like this after Sprint Planning:

It must be confused because the sprint actually started before we began adding items.

Is it not possible to specify a time for the sprint start?

We cannot start it from tomorrow the 28th, because work would have begun after Sprint Planning on the 27th.

Answer 1

No, this is currently (as of jan 2014) not possible, but requested numerous times in the past. I've discussed the item personally with some of the Product Team members responsible for this feature and I know that they would like to change this to support what you're asking for at some point. I couldn't find an item on uservoice in a quick search. You might want to raise a request there.