require 'active_support/inflector/methods' require 'active_support/core_ext/time/conversions' require 'active_support/core_ext/date_time/calculations' require 'active_support/values/time_zone' class DateTime # 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) # Convert to a formatted string. See Time::DATE_FORMATS for predefined formats. # # This method is aliased to to_s. # # === Examples # datetime = DateTime.civil(2007, 12, 4, 0, 0, 0, 0) # => Tue, 04 Dec 2007 00:00:00 +0000 # # datetime.to_formatted_s(:db) # => "2007-12-04 00:00:00" # datetime.to_s(:db) # => "2007-12-04 00:00:00" # datetime.to_s(:number) # => "20071204000000" # datetime.to_formatted_s(:short) # => "04 Dec 00:00" # datetime.to_formatted_s(:long) # => "December 04, 2007 00:00" # datetime.to_formatted_s(:long_ordinal) # => "December 4th, 2007 00:00" # datetime.to_formatted_s(:rfc822) # => "Tue, 04 Dec 2007 00:00:00 +0000" # # == Adding your own datetime formats to to_formatted_s # DateTime formats are shared with Time. You can add your own to the # Time::DATE_FORMATS hash. Use the format name as the hash key and # either a strftime string or Proc instance that takes a time or # datetime argument as the value. # # # config/initializers/time_formats.rb # Time::DATE_FORMATS[:month_and_year] = "%B %Y" # Time::DATE_FORMATS[:short_ordinal] = lambda { |time| time.strftime("%B #{time.day.ordinalize}") } def to_formatted_s(format = :default) if formatter = ::Time::DATE_FORMATS[format] formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter) else to_default_s end end alias_method :to_default_s, :to_s unless (instance_methods(false) & [:to_s, 'to_s']).empty? alias_method :to_s, :to_formatted_s # Returns the +utc_offset+ as an +HH:MM formatted string. Examples: # # datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24)) # datetime.formatted_offset # => "-06:00" # datetime.formatted_offset(false) # => "-0600" def formatted_offset(colon = true, alternate_utc_string = nil) utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon) end # 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 alias_method :default_inspect, :inspect alias_method :inspect, :readable_inspect # Converts self to a Ruby Date object; time portion is discarded. def to_date ::Date.new(year, month, day) end unless instance_methods(false).include?(:to_date) # Attempts to convert self to a Ruby Time object; returns self if out of range of Ruby Time class. # 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. def to_time self.offset == 0 ? ::Time.utc_time(year, month, day, hour, min, sec, sec_fraction * (RUBY_VERSION < '1.9' ? 86400000000 : 1000000)) : self end # To be able to keep Times, Dates and DateTimes interchangeable on conversions. def to_datetime self end unless instance_methods(false).include?(:to_datetime) def self.civil_from_format(utc_or_local, year, month=1, day=1, hour=0, min=0, sec=0) offset = utc_or_local.to_sym == :local ? local_offset : 0 civil(year, month, day, hour, min, sec, offset) end # Converts datetime to an appropriate format for use in XML. def xmlschema strftime("%Y-%m-%dT%H:%M:%S%Z") end unless instance_methods(false).include?(:xmlschema) # Converts self to a floating-point number of seconds since the Unix epoch. def to_f seconds_since_unix_epoch.to_f end # Converts self to an integer number of seconds since the Unix epoch. def to_i seconds_since_unix_epoch.to_i end private def seconds_since_unix_epoch seconds_per_day = 86_400 (self - ::DateTime.civil(1970)) * seconds_per_day end end