Some airports use different runways in different ways at different times. Heathrow normally use one for arrivals only and one for departures only and they swap over at 1500hrs each day (unless flights are operating west to east). Additionally in the early mornings, both runways operate in a mixed mode (both runways handle arrivals and departures).
In my current airport I have large numbers of arrivals after midnight no departures (apart from a few flights that push back between 2300hrs and midnight). After that there are no departures until those first arrivals depart from 0400 hrs onwards (4 hrs for a medium turnaround). Equally I have no arrivals after 2000hrs in order for all aircraft to leave by midnight.
It would be very useful for me to have my runways change operating modes at different times of day.
Rather than always having one arrivals and one departure, I’d like to be able to assign them as one arrivals only and one mixed mode between midnight and 0400 hrs, then switch to one arrivals and one departure and then switch to one mixed mode and one departure only runway from 2000hrs to midnight