Unlike any other value, the seconds can only be zeroed. Should this happen before 30 seconds, the watch will zero in at the beginning of the current minute. After 30 seconds it will start the next minute as displayed.
Unlike other values, the seconds can only be set to zero. If this occurs before 30 seconds, the watch will reset at the beginning of the current minute. After 30 seconds, it will start the next minute as shown.