Notifications for Custom Date Fields

[#1]

It would be really helpful if we could set up notifications on custom fields. Specifically an upcoming deadline based on a date field on a custom form. 

We have many different date fields we use on our custom forms to track deadlines. We can't rely on our users to constantly check reports to find the dates so sending notifications when a given date is approaching would be huge. 

How would you like the feature to work - when setting up a custom form field, giving us the option on a date field to specify the user(s) (likely, the request owner) to get notified and when the notification gets sent (1 month out, 1 week out, day of).