Jira Cloud has a built-in calendar feature.
Jira Server had a plugin directly from Atlassian.
Jira DataCenter has neither, as far as I can tell, and must rely on questionable Marketplace addons from questionable sources (like single developers from Russia). I'm wondering if there have been any statements of intent from Atlassian to perhaps port the Cloud calendar feature over to DataCenter, or implement a similar solution, in the not too distant future?
(To be clear, I'm not looking to sync with an external calendar, like Google or Exchange. I'm simply looking for a calendar contained within a Jira project, in which members of that project can schedule events.)