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Jira expression field code	`issue?.versions[0]?.releaseDate` `issue?.fixVersions[0]?.releaseDate`
Example output	2020-04-28
Output data type
Type
Available since

issue?.versions[0]?.releaseDate
issue?.fixVersions[0]?.releaseDate

Versions are stored in lists. Documentation on how to work with lists can be found here.

You can access the whole version by issue?.versions[0] and issue?.fixVersions[0] which returns a Version object, issue?.versions (and issue?.fixVersions) will return a list of objects.

Read

Returned value	The release date of the first (fix)version. If no (fix)version is available, null is returned.
Output data type
Example output	2020-04-28