If by portlet you mean a MDF or EC standard portlet then you can take advantage from MDF/EC alerts and notifications framework to achieve your goal. The core is the business rule you have to set up because you have to check the value fields within the portlet plus a date that answers when you want this alert to be send. I would suggest to follow these link which might help you to build your solution:
MDF Alerts foundations https://launchpad.support.sap.com/#/notes/0002532558 Inside this note pay attention to KBA 2431478 because it explains best practices for EC Alerts and examples (this is good foundation theory that works for MDFAlerts too)
On the other hand, if your portlet is inside Employee Profile section (backgrounds, employee profile block) you can not trigger alerts. If it is possible in your context, I would suggest to migrate it to a MDF object.
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