This chapter includes 20 problems that involve date and time. These problems are meant to cover a wide range of topics (converting, formatting, adding, subtracting, defining periods/durations, computing, and so on) via Date, Calendar, LocalDate, LocalTime, LocalDateTime, ZoneDateTime, OffsetDateTime, OffsetTime, Instant, and so on. By the end of this chapter, you will have no problems in shaping date and time, while conforming to your application's needs. The fundamental problems presented in this chapter will be very helpful for obtaining the bigger picture regarding date-time APIs, and will act like the pieces of the puzzle that need to be pieced together in order to resolve complex challenges involving date and time.