VFS visa form error: Cast from string "undefined / undefined / undefined" to type 'Date' is not valid.

The U.S VFS visa application site for India is a wonderful example of how not to design a website. However, rather than ranting, let me cut to the chase ...

If you received the error message Cast from string "undefined/undefined/undefined" to type 'Date' is not valid. while filling in the visa form, it's not your fault. You are probably using Firefox (very likely on Linux). The following are a few recommendations that will help you in filling in the form (in its present state):