Returns the week start (e.g. :monday) for the current request, if this has been set (via Date.beginning_of_week=). If Date.beginning_of_week has not been set for the current request, returns the week start specified in config.beginning_of_week. If no config.beginning_of_week was specified, returns :monday.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 19
def beginning_of_week
 ::ActiveSupport::IsolatedExecutionState[:beginning_of_week] || beginning_of_week_default || :monday
end

Sets Date.beginning_of_week to a week start (e.g. :monday) for current request/thread.

This method accepts any of the following day symbols: :monday, :tuesday, :wednesday, :thursday, :friday, :saturday, :sunday

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 27
def beginning_of_week=(week_start)
 ::ActiveSupport::IsolatedExecutionState[:beginning_of_week] = find_beginning_of_week!(week_start)
end

Returns Time.zone.today when Time.zone or config.time_zone are set, otherwise just returns Date.today.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 48
def current
 ::Time.zone ? ::Time.zone.today : ::Date.today
end

Returns week start day symbol (e.g. :monday), or raises an ArgumentError for invalid day symbol.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 32
def find_beginning_of_week!(week_start)
 raise ArgumentError, "Invalid beginning of week: #{week_start}" unless ::Date::DAYS_INTO_WEEK.key?(week_start)
 week_start
end

Returns a new Date representing the date 1 day after today (i.e. tomorrow’s date).

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 43
def tomorrow
 ::Date.current.tomorrow
end

Returns a new Date representing the date 1 day ago (i.e. yesterday’s date).

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 38
def yesterday
 ::Date.current.yesterday
end

Duck-types as a Date-like class. See Object#acts_like?.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/acts_like.rb, line 7
def acts_like_date?
 true
end

Provides precise Date calculations for years, months, and days. The options parameter takes a hash with any of these keys: :years, :months, :weeks, :days.

The increments are applied in order of time units from largest to smallest. In other words, the date is incremented first by :years, then by :months, then by :weeks, then by :days. This order can affect the result around the end of a month. For example, incrementing first by months then by days:

Date.new(2004, 9, 30).advance(months: 1, days: 1)
# => 2004年10月31日

Whereas incrementing first by days then by months yields a different result:

Date.new(2004, 9, 30).advance(days: 1).advance(months: 1)
# => 2004年11月01日

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 127
def advance(options)
 d = self
 d = d >> options[:years] * 12 if options[:years]
 d = d >> options[:months] if options[:months]
 d = d + options[:weeks] * 7 if options[:weeks]
 d = d + options[:days] if options[:days]
 d
end

Converts Date to a Time (or DateTime if necessary) with the time portion set to the beginning of the day (0:00) and then subtracts the specified number of seconds.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 55
def ago(seconds)
 in_time_zone.since(-seconds)
end

Converts Date to a Time (or DateTime if necessary) with the time portion set to the beginning of the day (0:00)

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 67
def beginning_of_day
 in_time_zone
end

Returns a new Date where one or more of the elements have been changed according to the options parameter. The options parameter is a hash with a combination of these keys: :year, :month, :day.

Date.new(2007, 5, 12).change(day: 1) # => Date.new(2007, 5, 1)
Date.new(2007, 5, 12).change(year: 2005, month: 1) # => Date.new(2005, 1, 12)

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 143
def change(options)
 ::Date.new(
 options.fetch(:year, year),
 options.fetch(:month, month),
 options.fetch(:day, day)
 )
end

Allow Date to be compared with Time by converting to DateTime and relying on the <=> from there.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 152
def compare_with_coercion(other)
 if other.is_a?(Time)
 to_datetime <=> other
 else
 compare_without_coercion(other)
 end
end

Converts Date to a Time (or DateTime if necessary) with the time portion set to the end of the day (23:59:59)

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 85
def end_of_day
 in_time_zone.end_of_day
end

Converts Date to a Time (or DateTime if necessary) with the time portion set to the middle of the day (12:00)

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 75
def middle_of_day
 in_time_zone.middle_of_day
end

Overrides the default inspect method with a human readable one, e.g., "2005年2月21日"

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/conversions.rb, line 63
def readable_inspect
 strftime("%a, %d %b %Y")
end

Converts Date to a Time (or DateTime if necessary) with the time portion set to the beginning of the day (0:00) and then adds the specified number of seconds

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/calculations.rb, line 61
def since(seconds)
 in_time_zone.since(seconds)
end

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

This method is aliased to to_formatted_s.

date = Date.new(2007, 11, 10) # => 2007年11月10日
date.to_fs(:db) # => "2007年11月10日"
date.to_formatted_s(:db) # => "2007年11月10日"
date.to_fs(:short) # => "10 Nov"
date.to_fs(:number) # => "20071110"
date.to_fs(:long) # => "November 10, 2007"
date.to_fs(:long_ordinal) # => "November 10th, 2007"
date.to_fs(:rfc822) # => "10 Nov 2007"
date.to_fs(:rfc2822) # => "10 Nov 2007"
date.to_fs(:iso8601) # => "2007年11月10日"

Adding your own date formats to to_fs ¶ ↑

You can add your own formats to the Date::DATE_FORMATS hash. Use the format name as the hash key and either a strftime string or Proc instance that takes a date argument as the value.

# config/initializers/date_formats.rb
Date::DATE_FORMATS[:month_and_year] = '%B %Y'
Date::DATE_FORMATS[:short_ordinal] = ->(date) { date.strftime("%B #{date.day.ordinalize}") }

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/conversions.rb, line 49
def to_fs(format = :default)
 if formatter = DATE_FORMATS[format]
 if formatter.respond_to?(:call)
 formatter.call(self).to_s
 else
 strftime(formatter)
 end
 else
 to_s
 end
end

Converts a Date instance to a Time, where the time is set to the beginning of the day. The timezone can be either :local or :utc (default :local).

date = Date.new(2007, 11, 10) # => 2007年11月10日
date.to_time # => 2007年11月10日 00:00:00 0800
date.to_time(:local) # => 2007年11月10日 00:00:00 0800
date.to_time(:utc) # => 2007年11月10日 00:00:00 UTC

NOTE: The :local timezone is Ruby’s process timezone, i.e. ENV['TZ']. If the application’s timezone is needed, then use in_time_zone instead.

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/conversions.rb, line 83
def to_time(form = :local)
 raise ArgumentError, "Expected :local or :utc, got #{form.inspect}." unless [:local, :utc].include?(form)
 ::Time.public_send(form, year, month, day)
end

Returns a string which represents the time in used time zone as DateTime defined by XML Schema:

date = Date.new(2015, 05, 23) # => 2015年5月23日
date.xmlschema # => "2015年05月23日T00:00:00+04:00"

Source: | on GitHub

# File activesupport/lib/active_support/core_ext/date/conversions.rb, line 95
def xmlschema
 in_time_zone.xmlschema
end