Ruby: Create range of dates

by

Using @CaptainPete’s base, I modified it to use the ActiveSupport::DateTime#advance call. The difference comes into effect when the time intervals are non-uniform, such as `:month” and “:year”

require 'active_support/all'
class RailsDateRange < Range
  # step is similar to DateTime#advance argument
  def every(step, &block)
    c_time = self.begin.to_datetime
    finish_time = self.end.to_datetime
    foo_compare = self.exclude_end? ? :< : :<=

    arr = []
    while c_time.send( foo_compare, finish_time) do 
      arr << c_time
      c_time = c_time.advance(step)
    end

    return arr
  end
end

# Convenience method
def RailsDateRange(range)
  RailsDateRange.new(range.begin, range.end, range.exclude_end?)
end

My method also returns an Array. For comparison’s sake, I altered @CaptainPete’s answer to also return an array:

By hour

RailsDateRange((4.years.ago)..Time.now).every(years: 1)
=> [Tue, 13 Oct 2009 11:30:07 -0400,
 Wed, 13 Oct 2010 11:30:07 -0400,
 Thu, 13 Oct 2011 11:30:07 -0400,
 Sat, 13 Oct 2012 11:30:07 -0400,
 Sun, 13 Oct 2013 11:30:07 -0400]


DateRange((4.years.ago)..Time.now).every(1.year)
=> [2009-10-13 11:30:07 -0400,
 2010-10-13 17:30:07 -0400,
 2011-10-13 23:30:07 -0400,
 2012-10-13 05:30:07 -0400,
 2013-10-13 11:30:07 -0400]

By month

RailsDateRange((5.months.ago)..Time.now).every(months: 1)
=> [Mon, 13 May 2013 11:31:55 -0400,
 Thu, 13 Jun 2013 11:31:55 -0400,
 Sat, 13 Jul 2013 11:31:55 -0400,
 Tue, 13 Aug 2013 11:31:55 -0400,
 Fri, 13 Sep 2013 11:31:55 -0400,
 Sun, 13 Oct 2013 11:31:55 -0400]

DateRange((5.months.ago)..Time.now).every(1.month)
=> [2013-05-13 11:31:55 -0400,
 2013-06-12 11:31:55 -0400,
 2013-07-12 11:31:55 -0400,
 2013-08-11 11:31:55 -0400,
 2013-09-10 11:31:55 -0400,
 2013-10-10 11:31:55 -0400]

By year

RailsDateRange((4.years.ago)..Time.now).every(years: 1)

=> [Tue, 13 Oct 2009 11:30:07 -0400,
 Wed, 13 Oct 2010 11:30:07 -0400,
 Thu, 13 Oct 2011 11:30:07 -0400,
 Sat, 13 Oct 2012 11:30:07 -0400,
 Sun, 13 Oct 2013 11:30:07 -0400]

DateRange((4.years.ago)..Time.now).every(1.year)

=> [2009-10-13 11:30:07 -0400,
 2010-10-13 17:30:07 -0400,
 2011-10-13 23:30:07 -0400,
 2012-10-13 05:30:07 -0400,
 2013-10-13 11:30:07 -0400]

More Related Contents:

  1. How to set up the Twitter gem in my Rails app?
  2. Rails ActiveRecord methods in different places [closed]
  3. How do I install sqlite3 for Ruby on Windows?
  4. How do I create multiple submit buttons for the same form in Rails?
  5. PG::Error: SELECT DISTINCT, ORDER BY expressions must appear in select list
  6. Limitations in running Ruby/Rails on windows
  7. Ruby Block Syntax Error [duplicate]
  8. Rails: What’s a good way to validate links (URLs)?
  9. ruby-debug with Ruby 1.9.3?
  10. Why can’t I install Rails on Lion using RVM?
  11. How do I wrap link_to around some html ruby code?
  12. POST json to rails server
  13. Getting fields_for and accepts_nested_attributes_for to work with a belongs_to relationship
  14. How to match accented characters with a regex?
  15. ‘require’: cannot load such file — ‘nokogiri\nokogiri’ (LoadError) when running `rails server`
  16. How do I create an average from a Ruby array?
  17. What are the brackets [5.1] after ActiveRecord Migration and how does it work? [duplicate]
  18. f.error_messages in Rails 3.0
  19. how to read a User uploaded file, without saving it to the database
  20. How to check a checkbox in capybara?
  21. Convert UTC to local time in Rails 3
  22. Rails Paperclip how to delete attachment?
  23. Rails Migrations: tried to change the type of column from string to integer
  24. String.force_encoding() in Ruby 1.8.7 (or Rails 2.x)
  25. How do you do relative time in Rails?
  26. NameError (uninitialized constant Paperclip::Storage::S3::AWS):
  27. rails bundle clean
  28. Creating Microsoft Word (.docx) documents in Ruby
  29. Is the server running on host “localhost” (::1) and accepting TCP/IP connections on port 5432?
  30. Unable to install MySQL2 gem on Windows 7

Leave a Comment