diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d87d4be
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,17 @@
+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..c0e8630
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in groupdate.gemspec
+gemspec
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..e2daad2
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,22 @@
+Copyright (c) 2013 Andrew Kane
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2ab9458
--- /dev/null
+++ b/README.md
@@ -0,0 +1,69 @@
+# Groupdate
+
+The simplest way to group by:
+
+- day
+- week
+- month
+- year
+- hour
+- microseconds
+- milliseconds
+- second
+- minute
+- quarter
+- decade
+- century
+- millennium
+
+:tada: Time zones supported!!
+
+PostgreSQL only at the moment - support for other datastores coming soon
+
+## Usage
+
+```ruby
+User.group_by_day(:created_at).count
+# => {2013-04-16 00:00:00 UTC=>50,2013-04-17 00:00:00 UTC=>100}
+
+Task.group_by_month(:updated_at).count
+# => {2013-04-01 00:00:00 UTC=>23,2013-04-01 00:00:00 UTC=>44}
+
+Goal.group_by_year(:accomplished_at).count
+# => {2012-01-01 00:00:00 UTC=>11,2013-01-01 00:00:00 UTC=>3}
+```
+
+The default time zone is `Time.zone`.  Pass a time zone as the second argument.
+
+```ruby
+User.group_by_day(:created_at, ActiveSupport::TimeZone["Pacific Time (US & Canada)"]).count
+# => {2013-04-16 00:00:00 UTC=>80,2013-04-17 00:00:00 UTC=>70}
+```
+
+Use it with anything that you can use `group` with:
+
+```ruby
+User.group_by_week(:created_at).sum(:tasks_count)
+
+User.group_by_hour(:created_at).average(:tasks_count)
+
+User.group_by_quarter(:created_at).maximum(:tasks_count)
+
+User.group_by_second(:created_at).average(:tasks_count)
+```
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'groupdate'
+```
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..2995527
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1 @@
+require "bundler/gem_tasks"
diff --git a/groupdate.gemspec b/groupdate.gemspec
new file mode 100644
index 0000000..16b42b1
--- /dev/null
+++ b/groupdate.gemspec
@@ -0,0 +1,25 @@
+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'groupdate/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "groupdate"
+  spec.version       = Groupdate::VERSION
+  spec.authors       = ["Andrew Kane"]
+  spec.email         = ["acekane1@gmail.com"]
+  spec.description   = %q{The simplest way to group temporal data}
+  spec.summary       = %q{The simplest way to group temporal data}
+  spec.homepage      = ""
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files`.split($/)
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.require_paths = ["lib"]
+
+  spec.add_dependency "activerecord", ">= 3.0.0"
+
+  spec.add_development_dependency "bundler", "~> 1.3"
+  spec.add_development_dependency "rake"
+end
diff --git a/lib/groupdate.rb b/lib/groupdate.rb
new file mode 100644
index 0000000..cd04b0b
--- /dev/null
+++ b/lib/groupdate.rb
@@ -0,0 +1,44 @@
+require "groupdate/version"
+
+module Groupdate
+  extend ActiveSupport::Concern
+
+  # Pattern from kaminari
+  # https://github.com/amatsuda/kaminari/blob/master/lib/kaminari/models/active_record_extension.rb
+  included do
+    # Future subclasses will pick up the model extension
+    class << self
+      def inherited_with_groupdate(kls) #:nodoc:
+        inherited_without_groupdate kls
+        kls.send(:include, ClassMethods) if kls.superclass == ActiveRecord::Base
+      end
+      alias_method_chain :inherited, :groupdate
+    end
+
+    # Existing subclasses pick up the model extension as well
+    self.descendants.each do |kls|
+      kls.send(:include, ClassMethods) if kls.superclass == ActiveRecord::Base
+    end
+  end
+
+  module ClassMethods
+    extend ActiveSupport::Concern
+
+    included do
+      # Field list from
+      # http://www.postgresql.org/docs/9.1/static/functions-datetime.html
+      %w(microseconds milliseconds second minute hour day week month quarter year decade century millennium).each do |field|
+        self.scope :"group_by_#{field}", lambda {|column, time_zone = Time.zone|
+          if time_zone.is_a?(ActiveSupport::TimeZone)
+            time_zone = time_zone.tzinfo.name
+          end
+          sql = "DATE_TRUNC('#{field}', #{column}::timestamptz AT TIME ZONE ?) AT TIME ZONE ?"
+          group(sanitize_sql_array([sql, time_zone, time_zone]))
+        }
+      end
+    end
+  end
+
+end
+
+ActiveRecord::Base.send :include, Groupdate
diff --git a/lib/groupdate/version.rb b/lib/groupdate/version.rb
new file mode 100644
index 0000000..b54ed80
--- /dev/null
+++ b/lib/groupdate/version.rb
@@ -0,0 +1,3 @@
+module Groupdate
+  VERSION = "0.0.1"
+end
--
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