I tried something new. It will probably never be finished. But I hope that at least the calendar and tasks itself will be ready.

I also want to say that I have no idea what I did, but the calendar works. YAY. 

If you add a task, it will be shown in the calendar. And the task is already taken or if the time is taken, it will be a print error, and you will know that you have to change something.

But I HAVE TO implement: If you click the task on the calendar, the task will be opened and you can change it.