An electronic timepiece includes a timer unit, a timepiece-side communication unit, a timepiece-side daylight saving time information storage unit and a processor. The timer unit counts local time at a current position. The timepiece-side communication unit communicates with an external device. The timepiece-side daylight saving time information storage unit stores daylight saving time implementation information therein at least at the current position. The processor corrects the local time in correspondence to an implementation situation of daylight saving time at the current position, based on the daylight saving time implementation information, acquires update information of the daylight saving time implementation information from the external device through the timepiece-side communication unit and reflects the acquired update information in the daylight saving time implementation information.

An electronic timepiece includes a timer unit, a timepiece-side communication unit, a timepiece-side daylight saving time information storage unit and a processor. The timer unit counts local time at a current position. The timepiece-side communication unit communicates with an external device. The timepiece-side daylight saving time information storage unit stores daylight saving time implementation information therein at least at the current position. The processor corrects the local time in correspondence to an implementation situation of daylight saving time at the current position, based on the daylight saving time implementation information, acquires update information of the daylight saving time implementation information from the external device through the timepiece-side communication unit and reflects the acquired update information in the daylight saving time implementation information.

A communication apparatus comprises a communicator that receives a standard time from an external apparatus, a manipulation receiver that receives a time correction action from a user, and a controller that performs a timing processing for clocking time and a time correction processing for correcting the time clocked by the timing processing, on the basis of the standard time received by the communicator, or on the basis of the time correction action received by the manipulation receiver. The controller changes processing contents of the time correction processing until a prescribed time interval has elapsed, when the time clocked by the timing processing is corrected on the basis of the time correction action received by the manipulation receiver.

A communication apparatus comprises a communicator that receives a standard time from an external apparatus, a manipulation receiver that receives a time correction action from a user, and a controller that performs a timing processing for clocking time and a time correction processing for correcting the time clocked by the timing processing, on the basis of the standard time received by the communicator, or on the basis of the time correction action received by the manipulation receiver. The controller changes processing contents of the time correction processing until a prescribed time interval has elapsed, when the time clocked by the timing processing is corrected on the basis of the time correction action received by the manipulation receiver.

A communication apparatus comprises a communicator that receives a standard time from an external apparatus, a manipulation receiver that receives a time correction action from a user, and a controller that performs a timing processing for clocking time and a time correction processing for correcting the time clocked by the timing processing, on the basis of the standard time received by the communicator, or on the basis of the time correction action received by the manipulation receiver. The controller changes processing contents of the time correction processing until a prescribed time interval has elapsed, when the time clocked by the timing processing is corrected on the basis of the time correction action received by the manipulation receiver.

A communication apparatus comprises a communicator that receives a standard time from an external apparatus, a manipulation receiver that receives a time correction action from a user, and a controller that performs a timing processing for clocking time and a time correction processing for correcting the time clocked by the timing processing, on the basis of the standard time received by the communicator, or on the basis of the time correction action received by the manipulation receiver. The controller changes processing contents of the time correction processing until a prescribed time interval has elapsed, when the time clocked by the timing processing is corrected on the basis of the time correction action received by the manipulation receiver.

Accurate and reliable time is acquired by a user equipment (UE) from a base station in a wireless network. The base station may obtain the time, e.g., UTC time or a GNSS time, and ciphers at least a portion of the time before broadcasting the time. The UE determines a propagation delay between the UE and the base station based on a timing advance, known locations of the UE and the base station, or a measured round trip propagation time (RTT) between the UE and the base station. A corrected time can be determined based on the time received from the base station and the propagation delay. A digital signature included with the time broadcast by the base station increases reliability. Spoofing of the broadcast time by an attacking device may be detected by the UE based on the propagation delay being outside an expected range.

Accurate and reliable time is acquired by a user equipment (UE) from a base station in a wireless network. The base station may obtain the time, e.g., UTC time or a GNSS time, and ciphers at least a portion of the time before broadcasting the time. The UE determines a propagation delay between the UE and the base station based on a timing advance, known locations of the UE and the base station, or a measured round trip propagation time (RTT) between the UE and the base station. A corrected time can be determined based on the time received from the base station and the propagation delay. A digital signature included with the time broadcast by the base station increases reliability. Spoofing of the broadcast time by an attacking device may be detected by the UE based on the propagation delay being outside an expected range.

An electronic device includes a communication unit that performs communication with an external apparatus; a timekeeping unit that performs timekeeping of time; and a control unit, after completion of a connection with the external apparatus using the communication unit, updates time of the timekeeping unit using time information when being in a state where time can be set by obtaining the time information from the external apparatus.

An electronic device includes a communication unit that performs communication with an external apparatus; a timekeeping unit that performs timekeeping of time; and a control unit, after completion of a connection with the external apparatus using the communication unit, updates time of the timekeeping unit using time information when being in a state where time can be set by obtaining the time information from the external apparatus.