One way to figure the start and end times for morning, afternoon, evening and night is to use the meteorological time, which must agree worldwide for forecasting. Meteorologists consider morning to be from 6 a.m. to 12 p.m. Afternoon lasts from 12 p.m. to 6 p.m. Evening runs from 6 p.m. to midnight. Overnight lasts from midnight to 6 a.m.