I am wondering if there's a certain time all Disney restaurants switch over to their supper menu? I need to make sure I get the dessert I want that's only offered at lunch.
I am not sure that many offer lunch and supper any more, but I woudl just check the times online. I imagine individual restaurants have specific times to make the switch.
Most of the restaurant menus no longer change, particularly in the parks. I believe most of time Dinner starts at 4:00 when the restaurant is open for lunch/dinner and 5:00 pm if it just opens for dinner.
The changeover time isn't the same at every restaurant throughout the resort. It will vary with the restaurant so check on the dining reservation page for the restaurant you're interested in and it will list the times for each of the meal services.