Dear all,
there is a functionality in Jira that allows to see how many days the ticket has been in the column: these are the dots on this ticket. 
The problem is that, when I take a ticket from the backlog, it appears that the ticket has been in the column "to do" of the sprint since several weeks, simply because it has the same status.
How can I use this functionality to verify how many days the ticket have been in the sprint, and not since the creation?
I tried to change the status automatically when the ticket is in the sprint, but this doesn't change the situation, because the first column includes the status "Backlog" and the status "To do". And if I try to remove the status "backlog" from my Scrum Board, all the "Backlog" tickets are not visible in the Backlog.