#

• <=>

A

• acts_like_date?,
• 推進,
• 之前,
• at_beginning_of_day,
• at_end_of_day,
• at_midday,
• at_middle_of_day,
• at_midnight,
• at_noon

B

• 一天的開始,
• 一週的開始,
• 設定一週的開始

C

• 變更,
• compare_with_coercion,
• compare_without_coercion,
• 今天

D

• default_inspect

E

• 一天的結束

F

• find_beginning_of_week!

I

• 之後,
• inspect

M

• 正午,
• 一天的中間,
• 午夜

N

• 中午

R

• readable_inspect

S

• 自從

T

• to_formatted_s,
• to_fs,
• to_time,
• 明天

X

• xmlschema

Y

• 昨天

• DateAndTime::Calculations
• DateAndTime::Zones

常數

屬性

類別公開方法

# 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

# 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

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

# 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

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

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

實體公開方法

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

Date.new(2004, 9, 30).advance(months: 1, days: 1)
# => Sun, 31 Oct 2004

Date.new(2004, 9, 30).advance(days: 1).advance(months: 1)
# => Mon, 01 Nov 2004

# 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

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

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

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)

# 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

# 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

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

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

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

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

date = Date.new(2007, 11, 10)       # => Sat, 10 Nov 2007

date.to_fs(:db)                     # => "2007-11-10"
date.to_formatted_s(:db)            # => "2007-11-10"

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)       # => "2007-11-10"

# 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}") }

# 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

date = Date.new(2007, 11, 10)  # => Sat, 10 Nov 2007

date.to_time                   # => 2007-11-10 00:00:00 0800
date.to_time(:local)           # => 2007-11-10 00:00:00 0800

date.to_time(:utc)             # => 2007-11-10 00:00:00 UTC

# 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

date = Date.new(2015, 05, 23)  # => Sat, 23 May 2015
date.xmlschema                 # => "2015-05-23T00:00:00+04:00"

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