I have the following code in my form.
<%= f.datetime_select(:date_time, :prompt => {:day => \'Day\', :month => \'Month\', :year => \'Year\'},
Remove :include_blank => false from your code.
:include_blank => false
<%= f.datetime_select(:date_time, :prompt => {:day => 'Day', :month => 'Month', :year => 'Year'}, :start_year => Date.today.year, :end_year => Date.today.year + 2, :minute_step => 15 %>
Thanks....