Using date_select only save the month into my DB

Hi

I have this code which shows a dropdownlist on the page showing just the month in words, e.g. December.

<%= form.label :movement_month %>
      <%= form.date_select :movement_month, order: [:month] %>

I would like to save just the month into my database but instead it is saving {1=>2018, 3=>1, 2=>6} into the database, obviously when I need to read that vakue I can pick out the month but is there anyway I can make it save just the month?

Thanks

Simon