Strange Field Names

Hola.

I am trying to use Validation API with a Date field in my registration form.

When looking at the field name, it is like so: "field_birthday[0][value][date]"

When I call that field name, or "field_birthday" from Validation API, it does not work. Any other field works.

Although this seems to be a weird issue with Date form-naming, maybe you can lead me somewhere?

Cheers!