What do you mean by Scheduling an issue?

We can schedule the issues due dates which are used to track, review, and inform the team about due dates. Scheduling an issue is the most powerful feature that performs the fixed and relative date searches based on the due dates.
 
Advanced searches can also be performed by using the Jira Query Language.
 
You can schedule an issue by using the Date field. It can be done either by creating a new issue or editing an issue.