When editing Control Tower Hours field you can use two input formats:
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Standard HH:MM format
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Sunrise/Sunset format where SR stands for Sunrise and SS stands for Sunset
Sunset/Sunrise format allows to input Control Tower Hours based on time (in hours-h or minutes-m) before/after Sunset or Sunrise.
For example if an airport opens 30 minutes after sunrise and closes 2 hours before Sunset, its opening time in Control Tower Hours field would be SR+30m and its closing time - SS-2h. Example of input in screenshot below
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When the flight is scheduled to take off or land outside permitted hours the folloring message will display: Departure (Destination) airport is closed at the time of departure (arrival)