Can the "discard_day" option be used with the select_date helper?

I'd like to be able to use the select_date helper, but exclude the day selection list vs. select_month and select_year. Is that possible? It doesn't seem to work, but thought I'd ask in case I might be doing something wrong.

Isn’t it date_select?

Depends on whether you're using it with form_for or form_tag. I'm using form_tag so it is select_date.