Not really what Epics are intended for, and off-the-shelf Jira, hence, does not have functions for it.
A simple answer that does "calculate dates from start date" type things would be to seek out automation or scripting apps that can work out new dates from your raw data (starting points and desired timetable)
But I do not think those are of a lot of help in real life - an arbitrary "we started Epic X on day Y, so it should finish on day Z" is completely "waterfall" or "predetermined", which immediately tells me that it's wrong. I've been doing software delivery for <mumble> years and I've only seen one project actually deliver its estimated Epics on the estimated day. (For scale, assume I complete 32 projects a year)
I am very much not saying your desire to put numbers on these things is wrong. What I am saying is that simple guesses at numbers are mostly useless and you should not be trying to do simplistic stuff like "X + Y = Z" without looking at all the other numbers that might affect X and Y.
I think you want to be looking more at the planning tools available. Yes, you can script or automate a simple calculation, and that can be useful. But my feeling is that you really want something more clever than a formula here. I'd be looking at the planning and Agile-related tools for Jira to do this sort of stuff.
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