Finding the min and max dates of a group of stories related to an epic

[J C]

Hi,

I'm trying to find the best possible way to find the min and max dates of two custom fields of a group of stories related to an epic.  We have two custom fields that we would like to get the earliest date and the latest date of and have the scripted field update in the epic it is related to.  Any references/thoughts/suggestions of a ScriptRunner flow that would assist with that task?

Thanks in advance!