“This is a complete and interesting book concerning functional dynamic equations on time scales. This book has 15 chapters and 5 appendixes, there are almost 900 pages with a precious content of the theory of time scales ... . This book will be very useful for all mathematicians that work with theory of time scales ... . Also, it can be used as a reference in courses of graduate level.” (Jaqueline Godoy Mesquita, zbMATH 1510.34001, 2023)