The Gordon Diary by Paul Gordon

The Gordon Diary is simply the best handling of this popular magic effect: A spectator names any date in the year. The performer uses his deck, or a borrowed deck and shuffles it, then a spectator selects a card, which is set aside. The spectator is given a pocket diary and shown that there is a card printed under each date. He/she is instructed to look up his or her selected date, and note the card printed beneath it. When the selected card is turned over, they match!
Easy to do. No stacked or memorized deck. No duplicate diaries. No sleights. No kidding! Simply stick this little diary in your shirt pocket and you are ready to perform any time, with anyone’s deck!