A time adjustment device having 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 component that corrects the internal time
information; and a reception controller that controls operation of the
reception unit; wherein the satellite signal contains satellite time
information that is kept by the positioning information satellite; the
reception unit can select a first reception mode for receiving first
information including the hour, minute, and second data in the satellite
signal, and a second reception mode for receiving second information
including the hour, minute, and second data, week information for the
current year, month, and day, and satellite health information in the
satellite signal; the time information adjustment component includes a
time adjustment recording component that records whether or not the time
was adjusted using the second information received in the second
reception mode after the internal time information was initialized, a
first time information adjustment component that controls the reception
unit by way of the reception controller in the first reception mode to
receive the first information, and sets the hour, minute, and second
values of the internal time information based on the received first
information, and a second time information adjustment component that
controls the reception unit in the second reception mode to receive the
second information, and sets the year, month, day, hour, minute, and
second values of the internal time information using the received second
information; the first time information adjustment component operates
when it is recorded in the time adjustment recording component that the
time was adjusted using the second information; and the second time
information adjustment component operates when it is not recorded in the
time adjustment recording component that the time was adjusted using the
second information.
