Q:

Rails 3 Need help with next month on a calendar

is it possible to advance a variable something like @current_month = Date.today.month+1 then forward it back to the index page, if so how

A:

@current_month = Date.today + 1.month

Not sure quite what you mean by 'forward it back to the index page', but if you then 
render :action => 'index'

the @current_month instance variable will be available to the index view of that controller. You could print out the month only by using strftime, eg <%= @current_month.strftime("%B") %>
Check out .strftime at http://www.ruby-doc.org/core/classes/Time.html#M000392

