You can populate ALL dates in a course with new dates at once (i.e. due, available from, until, lock on, etc.) by using a global feature “Populate All Dates”, located under the gear icon at the top right of Adjust-All HQ. In the popup window that appears, enter the dates that you want to populate your course with.
Choose to override all existing dates in your course with new defaults or select to skip existing dates and populate only blank fields with the new dates. Click on Apply.
You may back out of the changes by clicking on Cancel.