My radio-controlled watch set itself on top of the Empire State Building, is this a record? (FAQ - Time)
Your radio-controlled watch might be designed to work from the American station WWVB in Fort Collins, Colorado, which is intended to serve all of continental USA. If it is intended only to work from the British, or German, or Japanese signals it is unlikely to have received an adequate signal to reset itself. Most radio-controlled watches are designed to revert to the previous setting (allowing for the pause) after an unsuccessful attempt to re-synchronise. This may give the impression that the attempt has been successful. Some radio-controlled watches will ignore a request to re-synchronise if they have been set to a time zone more that two hours different from that of their reference signal.