gistfile1.txt

class Task < ActiveRecord::Base
  def self.todays_tasks
    where(due_date: Date.today.beginning_of_day..Date.today.end_of_day)
  end

  def self.tomorrows_tasks
    where(due_date: Date.tomorrow.beginning_of_day..Date.tomorrow.end_of_day)
  end
end

task.html.erb

<% current_task.todays_tasks.each_with_index do |task, i| %>
  <% if i == 0 %><strong>Today</strong><% end %>
  <%= task.description %>
<% end %>

<% current_task.tomorrows_tasks.each_with_index do |task, i| %>
  <% if i == 0 %><strong>Tomorrow</strong><% end %>
  <%= task.description %>
<% end %>