Bundt Cake Pan – Best Price!

I’ve got an old family recipe for a cake that makes two round layers. I’d like to make this cake, but the only problem with this is that I don’t have the round cake pans and don’t have someone I can borrow them from. I’d like to use the recipe to make a sheet cake in a 9×13 pan, but there’s no way the cooking time (and possibly temperature) could be the same. Is there a rule of thumb for how to adjust the cooking time and temperature for this?

I am making a sheet cake with a dream cake recipe. Can I bake it in a 17×12x1 sheet cake pan?