Patent ID: 8773955

Claim:
A time adjustment device comprising: a reception unit that receives satellite signals transmitted from positioning information satellites; a time information generating unit that generates internal time information; a time information adjustment unit that adjusts the internal time information; and a reception control unit that controls operation of the reception unit; wherein satellite time information that is kept by the positioning information satellites is contained in the satellite signal; the reception unit can select a first reception mode that receives first information including hour, minute, and second information, week information for the year, month, and day, and satellite health information from the satellite signal, a second reception mode that receives second information including leap second information in the satellite signal, and a third reception mode that receives third information including hour, minute, and second information in the satellite signal; the leap second information in the second information includes at least current leap second information; the time information adjustment unit includes a first information time adjustment means that receives the first information by the reception control unit controlling the reception unit in the first reception mode, and adjusts the year, month, day, hour, minute, and second of the internal time information based on the received first information, a second information time adjustment means that receives the second information by the reception control unit controlling the reception unit in the second reception mode, and adjusts the internal time information based on the received second information, a third information time adjustment means that receives the third information by the reception control unit controlling the reception unit in the third reception mode, and adjusts the hour, minute, second of the internal time information based on the received third information and leap second information, and a time adjustment recording means that records in a storage unit if the internal time information was adjusting using the first information, and if the internal time information was adjusting using the second information, after the internal time information was initialized; and the first information time adjustment means operates if adjustment of the internal time information by the first information is not recorded in the storage unit, the second information time adjustment means operates if adjustment of the internal time information by the first information is recorded and adjustment by the second information is not recorded in the storage unit, and the third information time adjustment means operates if adjustment of the internal time information by the first information and second information is recorded in the storage unit.