A free app for Android, by spwebgames.com.
In this app, you can select from different locations around the world and see which part of the world is in daylight, which part is in twilight, and which part is in darkness.
In the app, you can select from various timezones to show the current time in the selected location and also estimate the sunrise and sunset time. The date, time, and speed of the simulation can also be changed.
You can use the app as an Android widget. You can put the map on your home screen.
You can explore different reality scenarios, such as a change in the Earth's tilt.
