Need to set Notification prior to 1/3/18 on air table

Hello all!

I have an airtable issue where I’m trying to set up a notification for a field when Training Completion Date is prior to 1/3/18. For more clarification, the indicator is being used to know when to retrain my coworkers but I’m having trouble creating the equation if one exists. I’m still fresh to airtable, but I already see the appeal. If someone can help me create a formula for a column I would be very grateful. Thank you all for your time.