Daily change/rotation of an image

my app is almost done and wwith one thing i am still confused.
On one page i have an image that i use as a full background.
now i setup a collection Name, Backgrounds, Image ID & Relationship to “Users - One Background, many Users”

I would like to have that the background is changing daily automatically, i still can not figure out how to achiev that. Anyone here had experience with that and would like to help me out?

Many thanks in advance.

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