module ActiveSupport::CoreExtensions::DateTime::Conversions

def self.append_features(base) #:nodoc:

:nodoc:

def self.append_features(base) #:nodoc:
  base.class_eval do
    alias_method :default_inspect, :inspect
    alias_method :to_default_s, :to_s unless (instance_methods(false) & [:to_s, 'to_s']).empty?
    # Ruby 1.9 has DateTime#to_time which internally relies on Time. We define our own #to_time which allows
    # DateTimes outside the range of what can be created with Time.
    remove_method :to_time if instance_methods.include?(:to_time)
  end
  super
  base.class_eval do
    alias_method :to_s, :to_formatted_s
    alias_method :inspect, :readable_inspect
  end
end

def formatted_offset(colon = true, alternate_utc_string = nil)

datetime.formatted_offset(false) # => "-0600"
datetime.formatted_offset # => "-06:00"
datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24))

Returns the +utc_offset+ as an +HH:MM formatted string. Examples:

def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || utc_offset.to_utc_offset_s(colon)
end

def readable_inspect

Overrides the default inspect method with a human readable one, e.g., "Mon, 21 Feb 2005 14:30:00 +0000"

def readable_inspect
  to_s(:rfc822)
end

def seconds_since_unix_epoch

def seconds_since_unix_epoch
  seconds_per_day = 86_400
  (self - ::DateTime.civil(1970)) * seconds_per_day
end

def to_date

Converts self to a Ruby Date object; time portion is discarded

def to_date
  ::Date.new(year, month, day)
end

def to_datetime

To be able to keep Times, Dates and DateTimes interchangeable on conversions

def to_datetime
  self
end

def to_f

Converts self to a floating-point number of seconds since the Unix epoch

def to_f
  seconds_since_unix_epoch.to_f
end

def to_formatted_s(format = :default)

Time::DATE_FORMATS[:short_ordinal] = lambda { |time| time.strftime("%B #{time.day.ordinalize}") }
Time::DATE_FORMATS[:month_and_year] = "%B %Y"
# config/initializers/time_formats.rb

datetime argument as the value.
either a strftime string or Proc instance that takes a time or
Time::DATE_FORMATS hash. Use the format name as the hash key and
DateTime formats are shared with Time. You can add your own to the
== Adding your own datetime formats to to_formatted_s

datetime.to_formatted_s(:rfc822) # => "Tue, 04 Dec 2007 00:00:00 +0000"
datetime.to_formatted_s(:long_ordinal) # => "December 4th, 2007 00:00"
datetime.to_formatted_s(:long) # => "December 04, 2007 00:00"
datetime.to_formatted_s(:short) # => "04 Dec 00:00"
datetime.to_s(:number) # => "20071204000000"
datetime.to_s(:db) # => "2007-12-04 00:00:00"
datetime.to_formatted_s(:db) # => "2007-12-04 00:00:00"

datetime = DateTime.civil(2007, 12, 4, 0, 0, 0, 0) # => Tue, 04 Dec 2007 00:00:00 +0000
=== Examples

This method is aliased to to_s.

Convert to a formatted string. See Time::DATE_FORMATS for predefined formats.

def to_formatted_s(format = :default)
  return to_default_s unless formatter = ::Time::DATE_FORMATS[format]
  formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
end

def to_i

Converts self to an integer number of seconds since the Unix epoch

def to_i
  seconds_since_unix_epoch.to_i
end

def to_time

If self has an offset other than 0, self will just be returned unaltered, since there's no clean way to map it to a Time
Attempts to convert self to a Ruby Time object; returns self if out of range of Ruby Time class

def to_time
  self.offset == 0 ? ::Time.utc_time(year, month, day, hour, min, sec) : self
end

def xmlschema

Converts datetime to an appropriate format for use in XML

def xmlschema
  strftime("%Y-%m-%dT%H:%M:%S%Z")
end if RUBY_VERSION < '1.9'

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