One option for project created is to use the Audit Log, assuming it's activated - to access:
You can view when one project was created using this - or export the data (button in upper-right) and review it for more than one project.
For when it last had an issue updated, I would just export all the issues for the selected projects from the issue search and locate when the last issue update was performed for each.
Alternatively you might be able to query the database your instance sits on for this data - depends on your setup.
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events