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This type of read-only custom field has a value which is dynamically calculated from a custom math/time expression. It can be used to obtain a date-time value depending on the value of other fields in current issue or in any other issues (linked issues, sub-tasks, epics, stories, JQL selected issues, etc).
Configuration
Edit Math/Time Expression
Example: Date-Time of creation of an epic
Create a new Calculated Date-Time Field custom field and name it properly
Providing a description will help you to identify what the custom field does but this step is optional
Parser expression
Add the following expression:
first(fieldValue({00009}, linkedIssues("has Epic")))
Once configured, the new custom field should look like this:
If you still have questions, feel free to refer to our support team.