A radio-controlled watch configured to adjust time by receiving a signal containing time information from a satellite, the radio-controlled watch comprising: storage means for storing a leap second correction value to be used for leap second correction with respect to the time information; leap second display means for displaying a numerical value corresponding to the leap second correction value stored in the storage means; instruction receiving means for receiving an instruction operation of changing the leap second correction value from a user in a state in which the leap second display means displays the numerical value; and leap second correction value changing means for changing the leap second correction value stored in the storage means in response to the received instruction operation, wherein: the storage means are further configured to store information relating to an expiry date of the leap second correction value; the leap second correction value changing means are configured to update the information relating to the expiry date when changing the leap second correction value; and the radio-controlled watch further comprises determination result display means for determining, with use of the information relating to the expiry date, whether the leap second correction value stored in the storage means is valid or not, and displaying a result of the determination. storage means for storing a leap second correction value to be used for leap second correction with respect to the time information; leap second display means for displaying a numerical value corresponding to the leap second correction value stored in the storage means; instruction receiving means for receiving an instruction operation of changing the leap second correction value from a user in a state in which the leap second display means displays the numerical value; and leap second correction value changing means for changing the leap second correction value stored in the storage means in response to the received instruction operation, wherein: the storage means are further configured to store information relating to an expiry date of the leap second correction value; the leap second correction value changing means are configured to update the information relating to the expiry date when changing the leap second correction value; and the radio-controlled watch further comprises determination result display means for determining, with use of the information relating to the expiry date, whether the leap second correction value stored in the storage means is valid or not, and displaying a result of the determination. the storage means are further configured to store information relating to an expiry date of the leap second correction value; the leap second correction value changing means are configured to update the information relating to the expiry date when changing the leap second correction value; and the radio-controlled watch further comprises determination result display means for determining, with use of the information relating to the expiry date, whether the leap second correction value stored in the storage means is valid or not, and displaying a result of the determination.