app/models/iteration.rb
class Iteration < ActiveRecord::Base
belongs_to :burndown
has_many :metrics,
order: "captured_on ASC",
dependent: :destroy
def start_on
start_at.to_date
end
def finish_on
finish_at.to_date - 1.day
end
def start_at
read_attribute(:start_at).in_time_zone(burndown.utc_offset)
end
def finish_at
read_attribute(:finish_at).in_time_zone(burndown.utc_offset)
end
end