Hi there, Igor!
I've heard of this happening to Guests before and it's usually a simple setting adjustment on your computer that will do the trick.
If you can go to your computer settings, there will be a place for you to adjust date, time and time zone. It's different depending on whether you're on a pc or a mac. Once you get there, you'll see a place where you can actually adjust the format of how the date displays on your computer as well as on the different websites you visit. It's more than likely set to "DD/MM/YYYY" and you'll want to change it to "MM/DD/YYYY." Once you've done that, you should be able to make your
Chef Mickey's Advanced Dining Reservations without any problems. Also, you may need to restart your computer after you make the change just to reset everything.
I sure hope this helps, Igor! Thanks for stopping by the Moms Panel and please let us know if we can help with any other questions you have.
Wishing you and your family a Pixie Dusted vacation!
~Jackie