How to get a least value of date/time field from all issues from a filter

[CST JIRA Confluence Admin]

How to get a least value of date/time field from all issues from a filter

Is there a way to loop thru' all issues to get value of a field & find out least of it & store into a customfield ?

[Nic Brough -Adaptavist-]

You'll need some code to do this, and you need to think about when to run it (because if you store it and the data changes, you'll need to run it again to repopulate the target field)

The code wouldn't be too hard - there's API calls for "run jql, with an order by" to give you a list of issues, of which you can then just read the first one and grab the date off it.  As  usual, I'd use the script runner to do that (but it does depend on the "when to run it")