You have on your Samsung Galaxy S7 with the new Always On display the possibility to not only display the clock on the screen, but also the calendar or a picture. These settings can be found in Android in the following sub-menu:
Navigate from your device home screen to:
App Menu --> Settings --> Display --> Always On Display
Now go to "Display Content". Tap on this entry and you now have the option to choose between:
Now select the entry that you would like to see on the Always On display. You can then, for example, choose the calendar style or image.
You now know how to change the content displayed on the Always On display of the Samsung Galaxy S7.