A receiving apparatus is provided. The receiving apparatus includes circuitry configured to receive reference time information and metadata including information for executing processing related to the reference time information. The circuitry is configured to execute processing related to the reference time information based on the metadata. The metadata includes a first offset value between the reference time information and a discontinuous time, a second offset value between the discontinuous time and a local time, and a date and time at which a change in a daylight savings time (DST) status is to occur. The local time is determined based on the reference time information and the metadata.

An apparatus (10) configured to be connectable to a first electronic device (12) and a second electronic device (14). The apparatus comprises: a memory (16); a rechargeable battery (18); a real time clock (20); and engagement means. The engagement means is configured to releasably hold the apparatus in engagement with the first electronic device (12) to establish a first physical communication link between the apparatus (10) and the first electronic device (12). The engagement means is configured to releasably hold the apparatus in engagement with the second electronic device (14) to establish a second physical communication link between the apparatus (10) and the second electronic device (14). When held in engagement with the second electronic device (14) the apparatus (10) is configured to receive current time data from the second electronic device via the second physical communication link for storage in the real time clock (20), and recharge the rechargeable battery by the second electronic device (14). When subsequently held in engagement with the first electronic device (12) the apparatus (10) is configured to transmit current time data to the first electronic device (12) via the first physical communication link, receive data collected by the first electronic device (12) via the first physical communication link for storage in the memory (16), and power the first electronic device with the rechargeable battery (18).

A management apparatus in a time synchronization system includes a time variation information receiving unit configured to acquire time variation information and position information of a time synchronization apparatus, a position information classifying unit configured to classify time synchronization apparatuses into predetermined categories based on the acquired position information, a time variation analysis configured to determine majority based on whether patterns of time variation of the time synchronization apparatuses belonging to an identical category are identical to each other, and to analyze the time variation based on the determined results, and a filtering and delivery unit configured to output an instruction to block the time information received from the positioning satellite, to the time synchronization apparatus having abnormal time variation. A GPS-FW includes a filtering determination unit configured to blocks the time information received from a GPS satellite in a case where a block instruction is received from the management apparatus.

In order to simplify calculation of delay time lengths in a time synchronization device in a packet network, when executing time synchronization using a synchronization signal sent via the packet network, this time synchronization device 20 includes: a data receiving unit 21 that receives synchronization information including a time correction field used when correcting synchronization time information in a client device 30; a before-data-processing time correcting unit 22 that updates the time correction field by subtracting information indicating a time at which synchronization information is received, from the time correction field; an after-data-processing time correcting unit 23 that updates the time correction field by adding information indicating a time after performing data processing on the synchronization information, to the time correction information of the time correction field updated by the before-data-processing time correcting unit 22; and a data sending unit 24 that sends the updated synchronization information to the client device 30.

In order to simplify calculation of delay time lengths in a time synchronization device in a packet network, when executing time synchronization using a synchronization signal sent via the packet network, this time synchronization device 20 includes: a data receiving unit 21 that receives synchronization information including a time correction field used when correcting synchronization time information in a client device 30; a before-data-processing time correcting unit 22 that updates the time correction field by subtracting information indicating a time at which synchronization information is received, from the time correction field; an after-data-processing time correcting unit 23 that updates the time correction field by adding information indicating a time after performing data processing on the synchronization information, to the time correction information of the time correction field updated by the before-data-processing time correcting unit 22; and a data sending unit 24 that sends the updated synchronization information to the client device 30.

[Problem] It is possible to improve the quality of time information by suppressing a jump in time which arises when switching a transfer path in a BC apparatus to which transfer paths of time information of at least 2 systems are connected to an input side.

[Solution] A time synchronization apparatus 20 is mounted on a BC apparatus 12c in which two systems of at least a 0-system route (0-system) and a 1-system route (1-system) are connected to an input side, and includes a time correction value holding unit 26 configured to hold a 0-system correction value in which a time error resulting from delay of UTC due to performance inherent to the BC apparatus is the same value as a time error accumulated on the 0-system side and a 1-system correction value in which the time error is the same value as a time error accumulated on the 1-system side. Further, a failure restoration detection unit 23 configured to detect a failure in the 0-system or the 1-system, a time calculation unit 24 configured to perform correction by subtracting a 1-system correction value relating to a normal 1-system from UTC having time error accumulated on the normal 1-system side, when a failure in the 0-system is detected, and a path switching unit 25 configured to switch to the normal 1-system side such that the UTC after correction is transferred, when the failure is detected, are included.

A satellite radiowave receiving device includes a receiver performing a receiving operation of radiowaves transmitted from a positioning satellite and a processor controlling a positioning operation. The processor performs the positioning operation within at least a predetermined maximum positioning interval from a last positioning operation using preliminarily obtained date and time information and valid positional information on the positioning satellite to obtain a current position of the satellite radiowave receiving device and date and time information. The processor causes the receiver to perform the receiving operation within at least a predetermined date and time updating interval shorter than the predetermined maximum positioning interval from a last time when date and time information is obtained from radiowaves transmitted from a positioning satellite to obtain date and time information without the positioning operation.

A method for adjusting a timepiece including: providing a portable object including a screen and a camera; testing accuracy of a piece of time information of the timepiece by using the camera of the portable object to compare with a piece of time information obtained from an external source; sending the time information from the portable object to the timepiece if a difference is detected, the timepiece including at least one phototransistor arranged at a case for receiving the time information, the timepiece to display the correct time information, the sending including: defining on the screen of the portable object an area of shape and dimensions similar to the case of the timepiece; holding the case of the timepiece against the area; sequentially displaying black or white in the area, in a sequence of black and white corresponding to a luminous coding of the time information.

A method for adjusting a timepiece including: providing a portable object including a screen and a camera; testing accuracy of a piece of time information of the timepiece by using the camera of the portable object to compare with a piece of time information obtained from an external source; sending the time information from the portable object to the timepiece if a difference is detected, the timepiece including at least one phototransistor arranged at a case for receiving the time information, the timepiece to display the correct time information, the sending including: defining on the screen of the portable object an area of shape and dimensions similar to the case of the timepiece; holding the case of the timepiece against the area; sequentially displaying black or white in the area, in a sequence of black and white corresponding to a luminous coding of the time information.

An electronic watch includes memory that stores a reference time and a time difference relative to the reference time, a timekeeper that clocks the reference time, a time display unit that includes an hour hand displaying a display time based on the reference time and the time difference, a calendar display unit that displays a date based on the reference time and the time difference, an operation device that includes a crown or a button, and a controller that, in a set time-difference setting range, corrects the time difference at a regular interval for each of operations of the operation device, and updates the hour hand and the date in accordance with the corrected time difference.