It just came to my mind about this. When a psychic connected to someone, they might have this future vision when the client asked about the contact prediction, in the vision, they might see the date, the day, the season or calendar. But this vision won't come in all the time, many occasions, psychics will have a good guess based on the energy applied during the readings. Also, the future is so fluid, time is always very difficult to gauge. Many predictions that they made are also based on the current feelings and energies, or what cards are telling them, not that they can really see the future.