A radio-controlled timepiece can adjust the time with a short reception
process while also reducing the likelihood of incorrect adjustment. The
radio-controlled timepiece has a reception control means 31, time
information updating means 32, time adjustment storage means 33, and time
display means. The reception control means 31 has a simple time
adjustment means 330 that is driven within a predetermined time of the
last successful signal reception, and a normal time adjustment means 320
that is driven when this predetermined time has passed. The simple time
adjustment means 330 has a pulse timing detection unit 331, a offset
calculation unit 332, a offset evaluation unit 333, and a seconds
information adjustment unit 334. The pulse timing detection unit 331
detects the reference timing, which is the timing of the rising edge or
falling edge of rectangular wave pulses in the received time code. The
offset calculation unit 332 calculates the difference between this
reference timing and the timing of the seconds unit in the internally
kept time. The offset evaluation unit 333 determines if this offset is
within a tolerance range. The seconds information adjustment unit 334
adjusts the seconds unit of the internal time based on the offset if the
offset is within the tolerance range.