When it comes to planning our lives, date books can be a crucial tool in keeping track of appointments, deadlines, and events. However, there are many synonyms for the phrase "date books" that can be just as useful. "Planner" and "agenda" are two commonly used terms that imply a schedule or timeline of events. "Calendar" is another option, and it can often refer to a larger-scale planner that provides an overview of a month or year. Similarly, "schedule" can also be used to describe a list of planned events or appointments. Whatever term you prefer, having a way to keep track of important dates is essential to staying organized and on top of your responsibilities.