Electronic timepiece and time adjustment method for an electronic timepiece

A time adjustment method for an electronic timepiece that has a receiving unit that receives satellite signals transmitted from positioning information satellites, and acquires a week number that is incremented once a week and reset after a specific cycle, and a time of week denoting the date and time in the week identified by the week number using time passed from a time identified by the week number,

• a timekeeping unit that keeps time, and
• an operating unit that can be manually operated by a user,
• the time adjustment method comprising:
• a date determination information setting step that sets a unit that is part of a date composed of year, month, and day values set using the operating unit as date determination information;
• a date determination step that determines the date based on the week number, the time of week, and the date determination information;
• and
• a time adjustment step that determines the time expressed by the current year, month, day, hour, minute, second based on the date determined by the date determination step and the time of week, and adjusts the time kept by the timekeeping unit;
• wherein when the week number indicates an n-th cycle from a specific reference date as a cycle number, the date determination information setting step sets the date determination information using a partial unit that is a different number in each date corresponding to the same week number in a plurality of consecutive cycle numbers, and
• the date determination step acquires the date in each cycle number identified by the week number and time of week based on week number cycle information correlating week numbers, cycle numbers, and dates, and determines in which of these dates the partial unit matches the date determination information.