How does shrine rotation work?

I know that shrine resets every wednesday and has 2 survivor and killer perks, but I do not currently have BBQ+Chilli so i just wanted to know if there was any way to predict when a perk will next appear if there was any algorithm or such, if its not too far away ill wait but if its not for weeks ill just buy the leatherface dlc and face camp some kids for a while (im kidding don't hate me i think bubba face camping is ridiculous)

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