Is this date in the sense of a day and time? I thought Termin meant date in the sense of two people meeting.
Foremost, Termin is a date of day and time when something is appointed to happen. Two people might have a 'Termin', that would be an appointment, though. 'Termin' is used in a business-context, usually when at least one of the participants is a professional, like your doctor or a painter, or meetings that are fully between two or more people in their official business-positions. The appointed something might also be an event, like a show you're going to visit. In a private context, a date is 'Treffen', 'Verabredung' for the ascept of meeting.