For Date fields, would it be possible to link two of them, one as starting and one as end. That way if the starting has a date of Oct 2026, the earliest suggestion for the end time would be Oct 2026. And not Oct. 2024 like it happens now.
It's not possible to provide you smart suggestion on potential end dates based on the value you've added in another field that would be the start date.
Eventually, if you want the dates to be a bit "smarter", you can use a timeline view and place your idea in drag and drop directly onthe roadmap (so the end will necessarily be after the start date.
Best Regards,
Hermance
Product Manager @ Jira Product Discovery