"Surfer's alarm - Surf's UP" is an alarm clock app that can calculate the time of dawn and sunrise and set an alarm.
Also this app supports dark-themes of Android10.

The location information is got at the place where the alarm is set, and the dawn and sunrise times at that location are automatically calculated.
The time of dawn and sunrise can be easily set to the alarm time.

The condition once set is memorized, so next time you can set the alarm with the same condition with one tap. For examle, 10 minutes before sunrise, 20 minutes after dawn, etc..

You can set the alarm sound and ringing time. If you can't get up easily, you should select "long" or "never" in ringing time.

The app does not need to be running in the background. If you set an alarm, it can playback an alarm even if the app is completely died.


Note:
This app requires location information. Cannot be used if location information getting is not allowed.
Also, In order to pop up the alarm notification, it is necessary to allow the setting of "Display over other apps".
Please refer to the usage instructions for details. You can refer it from the app.