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This type of read-only custom field has contains 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 the 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

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Configuring a calculated date-time field is straightforward. You have to configure a valid parser expression, which will "calculate" the output, and optionally a custom display format.

UI Steps

UI Step Create a new Calculated Date-Time Field custom field called "Date-Time Creation of Epic" Head over to Administration → Issues Image Removed → Custom fields → Add custom Field → Advanced → Calculated Date-Time Field (by JWT) Image Removed UI Step On the configuration screen of the newly created custom field go to Actions and click on Configure Image Removed custom field and name it properly. UI Text Box type tip Providing a description will help you to identify what the custom field does but this step is optional. Finally, the configuration of the new custom field should look like this: Image Removed UI Step Click on Edit Math/Time Expression Image Removed Math/time expression Add a valid parser expression which will "calculate" the output. Usually field codes will be used for this purpose. Code Block language bash title Expression linenumbers true %{issue.updated} #This example simply returns the timestamp (date-time) of when an issue was last updated. UI Step Configure the field by entering a math/time expression. Learn more about JWT expression parser. After the configuration, click on Save Image Removed UI Text Box type info The math expression used in this example is: first(fieldValue({00009}, linkedIssues("has Epic"))) , where {00009} is code for numeric value of Date and time of creation field. UI Step tip The result of the calculation must be a valid timestamp. Read more about working with Dates, times and time zones. UI Step Display format Optionally choose a custom display format. This is extremely useful to enhance usability for end users. Read more about the available Display formats.

Image AddedUse cases and examples