A date book, also known as a planner or agenda, is a useful tool for keeping track of important dates, appointments, and events. However, sometimes we need to mix things up and use different words to express the same thing. Some synonyms for date book include calendar, daybook, itinerary, schedule, engagement book, and diary. Each of these words has its unique connotation and may be preferred over others in certain situations. For instance, a calendar is ideal for tracking dates and holidays, while an engagement book is best suited for recording business appointments and contacts. Regardless of the word used, the purpose remains the same: to keep organized and never forget an important date or event.