Bug in forms.inc expand_date function (affects all '#type' => 'date' forms)

There is a bug either in profile.module (where it's called from) or form.inc with the "date" type form field. The date entered does not get saved.

To reproduce,

1. create a "date" field in user profile
2. set the date
3. save or just preview.

The date is going to be wrong. The reason is that all form field names for year, month, and day are the same:

<select name="edit[profile_bday]"  id="edit-profile_bday"><option ...  (for year)
...
<select name="edit[profile_bday]"  id="edit-profile_bday"><option ... (for month)
...
<select name="edit[profile_bday]"  id="edit-profile_bday"><option ... (for day)

Before the new Forms API they were:

<select name="edit[profile_date][year]" id="edit-profile_date-year"><option ...
...
<select name="edit[profile_date][month]" id="edit-profile_date-month"><option ...
...
 <select name="edit[profile_date][day]" id="edit-profile_date-day"><option ...

I couldn't figure this one out and write a patch...
Darius