Issue links in Jira are a helpful tool to keep track of changes throughout different issues.
In the following use case the due date of the current issue will be copied to all blocking issues.
Add the Update linked issue or sub-task post function to the desired transition or create a new transition.
Click on Add field
Choose Due date
Choose Copy field value form current issue
Click on Add
Update the following filters according to your needs.
Choose is blocked by
Update linked issue or sub-task