A time management system includes a terminal, a server, and a calculation unit. The terminal moves with the vehicle using the berth. The server connects the terminal via a network. The calculation unit calculates an estimated arrival time when the vehicle moving arrives at the berth based on position information. The server allocates a usage time of using the berth by the vehicle arriving at the berth at the estimated arrival time based on the estimated arrival time calculated by the calculation unit and a vacancy situation of the berth, and notifies the terminal moving together with the vehicle of the usage time allocated by the allocation unit. The terminal includes an output unit that the usage time notified from the server.