A radiation imaging system including: a radiation imaging apparatus for obtaining a captured image by radiographic image capturing of a subject； and an external apparatus connectable to the radiation imaging apparatus, the external apparatus including a system time management unit for managing a system time serving as a reference time of the radiation imaging system, the radiation imaging apparatus including: an imaging apparatus time management unit for managing an imaging apparatus time, which is a time on the radiation imaging apparatus； a storing unit for storing image capturing information in association with the captured image obtained by the radiographic image capturing, the image capturing information including at least image capturing time information which is determined based on the imaging apparatus time； and a time correction unit for obtaining the system time and correcting the image capturing time information based on the imaging apparatus time and the system time.
