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Common date time formats for Rails applications
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Almost every Rails project I start requires the use of custom formats for outputting Time. It's pretty trivial to add to a project, but I always forget the constant name for the initializer. It's Time::DATE_FORMATS. I inevitably have to google or look in previous projects. Not a big deal, but nonetheless, it's unnecessary.

This Gem provides some common formats as well allowing you to define your own in a date_time_formats.yml file.


Add this line to your application's Gemfile:

gem 'date_time_formats'

And then execute:

$ bundle

Or install it yourself as:

$ gem install date_time_formats


DateTimeFormats adds support for common formats on the "Time#to_s" method  # => 2012 # => 1/01/2012

DateTimeFormats comes with a default set of formats. You can define your own by adding a config/date_time_formats.yml file to your Rails app. The syntax is simple key value YAML.

# config/date_time_formats.yml
year_and_day: "%Y-%d"


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request
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