Timepiece, control method for change of time, and storage medium

A control method for a change of a time, comprising:

• measuring a current time;
• receiving a signal that includes time information;
• controlling a changing operation of the current time based on the received time information;
• and
• controlling a presenting operation of whether or not the changing operation has been performed, wherein
• the changing operation is controlled based on a first flag indicating whether or not the time information is successfully received, and
• the presenting operation is controlled based on a second flag indicating whether or not the changing operation is successful within a predetermined period of time.

A non-transitory storage medium storing thereon a program readable by a computer incorporated into a timepiece, the timepiece comprising a clock circuit and a signal receiver configured to receive a signal including time information, the program causing the computer to:

• control a changing operation a current time measured by the clock circuit based on the time information obtained from the signal receiver, and
• control a presenting operation of whether or not the change operation is successful, wherein
• the controlling of the changing operation includes controlling based on a first flag indicating whether or not the signal receiver successfully receives the time information, and
• the controlling of the presentation operation includes controlling based on a second flag indicating whether or not the changing operation is successful within a predetermined period of time.