What time is the night in the weather forecast?

The forecast time limit stipulated by China Meteorological Observatory is that the afternoon forecast, from today's night (night) to tomorrow (day), refers to 20: 00 on the same day to 20: 00 the next day, 20-08 at night and 08-20 at day; Morning forecast, today's day to night: 08:00 on the same day-08: 00 on the next day.