For our Change Management project, we use 2 customer fields, Planned Start and Planned End rather than a "due date". What I am trying to do is send out a reminder using automation when that Planned Start is reached and the status hasn't been advanced. An issue will be sitting at status Awaiting Implementation. When the change is started, the status should be changed to Implementing by the change owner (Assignee) manually. I'm new to Jira as a whole, but I have made a number of automation rules. I couldn't figure out how to do this with the non-JQL options.