I have a custom object Projects that have date field milestones. I want to create a task and an email alert when the task is generated 3 days before each milestone. But the dates are subject to change so I dont want to invoke a process on record creation because then the new date changes will not reflect on the process? And I do not want to invoke the process on record change because then it would set off a new task set every time something changes and some of those task could already be completed.
