Edit dates report
Note: You are currently viewing documentation for Moodle 3.3. Up-to-date documentation for the latest stable version of Moodle is probably available here: Edit dates report.
This 'report' is actually at tool that lets you edit all the dates for all] the activities in your course on a single page.
Once the plugin is installed, you can access the functionality by going to Reports -> Dates in the navigation block when you are looking at the course.