I am looking for a JQL to list all stories and subtasks similar to parent and child relationship.

[Nagendra Dattatreya]

I have a JIRA project that has a lot of stories and subtasks. I am looking for a way to report all stories and subtasks created between certain dates. I want the subtasks listed right below the parent story.

[Marianne Miller]

This specific functionality requires a plug in - there are a few that do this.  However, You can use a JQL Query to display the sub-tasks, and order them by Summary, which will aggregate them by Issue and show you those relationships.  You can export this data set and manipulate it in excel as needed.

project = XXX AND issuetype in (Sub-task, Story) and createddate > 2019-01-01 and createdDate < 2019-12-31 ORDER BY summary ASC

Where XXX = your Project ID

update your created date after/before numbers as appropriate

[Nagendra Dattatreya]

Order by Summary will just sort by summary and subtasks wont be listed under Story.

[M Amine]

I think that the easiest way is to display subtasks in columns in the search issues view (see image below). 

So in you JQL you will search only tasks and for each task you can display all needed information + subtasks. 

[Nagendra Dattatreya]

I am using this JQL but subtasks are not displayed below the parent stories.

project = xxx AND issuetype in (Story, Sub-task, "Functional Bug") AND created >= 2018-12-18