A method (P1) for coding a solar time, called the initial solar time (Hs1), associated with a geographical location (Loc) and with a day (J1) of the year, wherein the method includes selecting SEL(Href, Nb1) a reference time (Href) and an initial number of bits (Nb1) as a function of the type of initial solar time (Hs), computing CALC(Nm1) a number of minutes (Nm1) separating the initial solar time (Hs1) and the reference time (Href), coding COD(Hs1) the number of minutes (Nm1) in the initial number of bits (Nb1).

A satellite radio-controlled watch, including a receiving unit for receiving a satellite radio wave containing time information and position information; a storage unit for storing intersection point information indicating a position of an intersection point between a reference line along a great circle orthogonal to a specific great circle on the earth or a reference line along the specific great circle on the earth or a circle parallel to the great circle and a time zone boundary, and time difference division information on a wedge-shaped or belt-shaped area that is adjacent to the reference line and to which the intersection point belongs, and a time zone determination unit for determining a time zone, based on the position information, the intersection point information, and the time difference division information.

An electronic timepiece includes a clock circuit, a receiver that receives radio waves from positioning satellites, an operation receiving unit, and a control unit constituted by a CPU and a module controller. The control unit makes the receiver perform either one of a date and time reception process that attempts to obtain date and time information and a positioning reception process that attempt to obtain information needed to obtain the current location; and, when a prescribed input operation that affects the current region setting is received, the control unit makes the receiver perform the positioning reception process at least once in the reception operations that are performed after receiving the prescribed input operation before a prescribed location updating event that determines a current location of the electronic timepiece occurs.

An electronic timepiece includes a clock circuit, a receiver that receives radio waves from positioning satellites, an operation receiving unit, and a control unit constituted by a CPU and a module controller. The control unit makes the receiver perform either one of a date and time reception process that attempts to obtain date and time information and a positioning reception process that attempt to obtain information needed to obtain the current location; and, when a prescribed input operation that affects the current region setting is received, the control unit makes the receiver perform the positioning reception process at least once in the reception operations that are performed after receiving the prescribed input operation before a prescribed location updating event that determines a current location of the electronic timepiece occurs.

A satellite radio wave receiving device includes: a receiver that receives a satellite radio wave to identify a reception signal; and a processor that acquires primary date and time information from the identified reception signal and outputs a date and time notifying signal indicating date and time based on the primary date and time information to an outside of the satellite radio wave receiving device. The date and time notifying signal includes at least a timing notifying signal indicating a predetermined timing. The processor determines the predetermined timing without consideration of a timing of a second synchronization point which is a leading edge of every second in the date and time based on the primary date and time information, and outputs the timing notifying signal at the predetermined timing.

A satellite radio wave receiving device includes: a receiver that receives a satellite radio wave to identify a reception signal; and a processor that acquires primary date and time information from the identified reception signal and outputs a date and time notifying signal indicating date and time based on the primary date and time information to an outside of the satellite radio wave receiving device. The date and time notifying signal includes at least a timing notifying signal indicating a predetermined timing. The processor determines the predetermined timing without consideration of a timing of a second synchronization point which is a leading edge of every second in the date and time based on the primary date and time information, and outputs the timing notifying signal at the predetermined timing.

According to an aspect of the present invention, a device capable of wireless communication includes a counter for counting current time, and a processor for setting a communication mode of the device to one of a notification mode in which the device sends a first notification signal for informing of its existence and a detection mode in which the device detects a second notification signal sent from other device. In the case that the processor changes the communication mode of the device from the notification mode to the detection mode and the second notification signal received in the detection mode includes first time information, the processor corrects time of the counter based on the first time information.

According to an aspect of the present invention, a device capable of wireless communication includes a counter for counting current time, and a processor for setting a communication mode of the device to one of a notification mode in which the device sends a first notification signal for informing of its existence and a detection mode in which the device detects a second notification signal sent from other device. In the case that the processor changes the communication mode of the device from the notification mode to the detection mode and the second notification signal received in the detection mode includes first time information, the processor corrects time of the counter based on the first time information.

An information display device includes: a communications part that receives, from multiple external devices, information on a time zone of the current position identified by the multiple external devices; a time zone-identification part that identifies a time zone of the current position of the self-device, on the basis of the information received from the multiple external devices; and a display control part that displays time in the identified time zone of the current position on a display part, in which the time zone-identification part repeatedly calculates, for a first predetermined time length, an accumulated time in which time zones received from a predetermined number of the external devices match one another, and when the accumulated match time is not shorter than a predetermined time, identifies the matched time zone as the time zone of the current position.

A satellite-synchronized network clock may include an oscillator, a global navigation satellite system (GNSS) time receiver module, and a control subsystem. The GNSS time receiver module may include a time receiver, a multiplexer, and a plurality of source inputs. The control subsystem may configure the multiplexer and time receiver of the GNSS time receiver module to sequentially receive time signals from a plurality of GNSS satellite constellations. Methods of synchronizing multiple time sources may include sequentially receiving a first time signal from a first GNSS constellation, a second time signal from a second GNSS constellation, and a third time signal from a third GNSS constellation with a GNSS receiver. The methods may further include measuring a phase and frequency offset of each respective received time signal relative to an oscillator and comparing the measured offsets to determine the accuracy of each of the received time signals.