"Today's event" of Nippon Television Network Corporation steps over the day when there is time broadcast by 23:24 ?23:58 (23:25 accurately), and it shifts during 35?60 minute in baseball etc.When the date of 0:00AM in a word catches ..the change.., it becomes not the event today but yesterday's event. However, man has caught as "Today" before it sleeps as a sense though he steps over the day. The turn of the date is assumed to be a source necessary in the system of broadcasting of the television and the radio in morning 3:00(27:00). When 0:00AM is stepped over, it treats for NHK as "Yesterday".