I have data on an old sprint which was recorded in Excel. Now, I want to import the issues into JIRA and be able to view sprint reports of the same.

I am able to view a burndown chart only when I change the scope of each issue, from 'To-do' to 'Done' or 'In progress'. The actual end date is way before the current date on which I changed the scope of the issues. But JIRA considers the current date (The day I change the scope of an issue) in the burndown chart.

Is there a way, where I JIRA can consider the actual end date mentioned in my sprint data sheet so that I could import my old data and still produce valid reports.