Simple ruby date range splitter

date_range_splitter.rb

class DateRangeSplitter
  include Enumerable

  def initialize(date_from, date_to, max_days, end_inclusive: true)
    @date_from = date_from
    @date_to   = date_to
    @max_days  = max_days
    @end_inclusive = end_inclusive
    generate_split_dates
  end

  def each
    return enum_for(:each) unless block_given?
    @dates.each { |date_block| yield(date_block[0], date_block[1]) }
  end

  private

  def generate_split_dates
    start_date = @date_from
    @dates = []
    begin
      end_date = start_date + (@end_inclusive ? @max_days - 1 : @max_days).days
      if end_date <= @date_to
        @dates << [start_date, end_date]
      else
        @dates << [start_date, @date_to]
        break
      end
      start_date = @end_inclusive ? end_date + 1.day : end_date
    end while start_date <= @date_to
    @dates
  end
end

As mentioned in this thread: https://stackoverflow.com/questions/9795391/is-there-a-standard-for-inclusive-exclusive-ends-of-time-intervals We should prefer inclusive start dates and exclusive end dates.

We can split a DateRange into days, weeks, months or years with the following tail recursive method:

  class DateRange
    def initialize(since_date, until_date)
      @since_date = since_date
      @until_date = until_date
    end

    def split_to(timespan)
      return [] if @since_date == @until_date
      end_date = [@since_date.send("next_#{timespan.to_s.singularize}"), @until_date].min
      [DateRange.new(@since_date, end_date)] + DateRange.new(end_date, @until_date).split_to(timespan)
    end
  end

This method takes :days, :weeks, :months or :years as a parameter. Notice that we rely on activesupport.