In 9.1SP5, you got very little information about when a test was started/submitted.
Here is the Grade Details screen for a student. We can see the Date Submitted (or Saved). But we have no indication of how long they took on the assessment (Elapsed Time). This has been an issue when a student has a problem on a timed test, and the instructor wants to know how much "extra time" to give a re-take.
If you go into the attempt, you have very little Test Information.
Now, in 9.1 SP7, we have the start (Date Created) and submission time on the Grade Details screen.
And, if you go into the attempt, and look at the Test Information, you have Time Elapsed, Started Date and Submitted Date.