Twilight time is a scientifically accurate simulation of the Earth, which lets the user specify locations on the planet surface. The app then gives the sunrise and sunset times at these locations accurately. The app can also be used to visualize the Earth from space at any given date and time. The sunrise and sunset times are then updated appropriately and it is for instance possible to look when the sun rises and sets at your birthday. The app also works as a world clock: in the list mode it gives the current time at the chosen locations.

Twilight time operates in two modes, in the first mode all times are shown in the phone local time and you can for instance check when the sun sets in München in your time. In the second mode all times are shown in the local time of the place in question, this means that you can check when the sun sets in München in the local time of Germany. The app also takes in account all daylight saving rules and time zones.