Here's an app that'll help you with the schedule of different competitive programming contests. Link -> https://play.google.com/store/apps/details?id=com.voidmemories.codeclock&hl=en_IN&gl=US

I’m also releasing the iOS version within a week. If you want to hear about it when it comes out, you may join the telegram channel for that -> telegram.me/codeclock

We’re just starting out, but we have huge plans for the app.