For nearly 100 years, “time-of-day” telephony or dedicated radio station services have helped humans set their clocks. Soon, applications and devices will use 5G networks to automatically set and keep their time to microsecond accuracy enabling new private, public and industrial use cases and experiences. In this white paper, we explore some of the many possible use cases that can benefit from 5G time synchronization services either if the consumers of time require precise time or the devices are located outdoors or deep indoors. We explain how time-of-day services provided by 5G will facilitate a simple way for users and different types of devices to obtain accurate time.