Creating alarm feature

I am looking to create a alarm feature that can be programmed to ring when alarm is set. Is there a way to code it in MIT app
Since i couldn’t find anything, so i used taifun alarm extension and it serves the purpose but then upload to gallery is not allowed for apps that use extensions
can anyone suggest a solution to this problem
The attached image shows the feature that i need and use of taifun extension

sounds great! Thank you for using the extension!

that's correct, apps which use extensions are not allowed in the gallery

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.