A free program for Android, by Markhoor Studio.

Alarm Clock – Night Clock is an alarm and clock app to help you wake up in the morning and ensure you don’t miss any important events or deadlines. It has a straightforward and intuitive interface, so it’s easy to use. It has multiple themes to help you customize it to your style. It’s very easy to set as your home screen or lock screen. It can be set to work with your phone’s default alarm, or you can set it to work with your phone’s default clock. You can set it to remind you of all sorts of things, like meeting deadlines or making sure you do your homework. If you want to set it to remind you of one specific event, like a birthday or an anniversary, you can do that too. It has a simple and intuitive interface, so it’s easy to use.