How to switch to the day calendar with iOS 7

I recently switched an iPhone from iOS 6 to iOS 7.1.2. Within iOS 6 I was using Calendar on the day display and week display mode continuously. It was easy to a point I can't even recall how I did this switching (we should take notes when we see an interface which is working nicely).

With iOS 7.1.2 I have a serious interface problem.

Within Calendar I am able to switch from an annual view to a month view with the month name topleft red button. I discovered that I can also switch back to the month view by clicking on the month name red header. But I can't see any way to switch to a day or week view. On the bottom left corner I have a Today red button, but it doesn't do anything.

What is the intelligent method to access the actual day calendar?

To toggle from month to week view, turn the phone sideways.

Day view is dependant on whether or not you have the list view on or off [highlighted in blue] If that's on, the day's events appear underneath the month. If it's off, tapping a day will take you to that day's view.

Once in Day view, the same button will then toggle between single day & list of upcoming events view.

Month view

Week view

Day view

Event list