Following expression doesn't work for simple_form. Expected date is still blank (it should be only blank if default value is nil)
<%= f.input :expected_date, :as => :date, :include_blank => true, :default => Date.today %>
Have also tried to specify :value =>
This is how Rails works, if you set either :include_blank or prompt, the :default is not used, as you can see in the source code. You can try the same calling date_select directly.
try selected: Date.yesterday. Works with me :-)
Most helpful comment
try
selected: Date.yesterday. Works with me :-)