Identical version of the Calendar app, but icon behaves differently on phone and tablet - why?

I've recently noticed that the Calendar app icon on the homescreen of my Samsung Galaxy Tab S 10 changes daily, displaying the number of the day in the month - so now it's a blue opening page with a white "2" in the centre. Whereas on my HTC 10 phone, running exactly the same version of the app (5.7.35-165431130-release) it always stays the same: a blue opening page with a white "31". Furthermore, the phone is running a later version of Android - 7.0 - while the tablet's still on 6.0.1. I do have the Nova launcher on the tablet, but not aware of having set it, or it being capable, for that level of interaction. I'm intrigued.

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