The world is busier than ever — hustle and bustle are the name of the game — and it can be hard to keep up with it all. To help, most people use a calendar in some form or another; indeed, many people have multiple calendars. From a large desk planner to the cute designs you can hang on your wall, calendars help keep you on track. Only in the last decade or so have more and more people come to use a digital calendar, which can act like your personal assistant. Still, so many features of the digital calendar go underutilized when using them could dramatically change your workday and even your l…