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module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Date #:nodoc:
# Enables the use of time calculations within Time itself
module Calculations
def self.included(base) #:nodoc:
base.send(:include, ClassMethods)
base.send(:alias_method, :plus_without_duration, :+)
base.send(:alias_method, :+, :plus_with_duration)
base.send(:alias_method, :minus_without_duration, :-)
base.send(:alias_method, :-, :minus_with_duration)
end
module ClassMethods
def plus_with_duration(other) #:nodoc:
if ActiveSupport::Duration === other
other.since(self)
else
plus_without_duration(other)
end
end
def minus_with_duration(other) #:nodoc:
if ActiveSupport::Duration === other
plus_with_duration(-other)
else
minus_without_duration(other)
end
end
# Provides precise Date calculations for years, months, and days. The +options+ parameter takes a hash with
# any of these keys: :months, :days, :years.
def advance(options)
d = ::Date.new(year + (options.delete(:years) || 0), month, day)
d = d >> options.delete(:months) if options[:months]
d = d + options.delete(:days) if options[:days]
d
end
# Returns a new Date where one or more of the elements have been changed according to the +options+ parameter.
#
# Examples:
#
# Date.new(2007, 5, 12).change(:day => 1) # => Date.new(2007, 5, 12)
# Date.new(2007, 5, 12).change(:year => 2005, :month => 1) # => Date.new(2005, 1, 12)
def change(options)
::Date.new(
options[:year] || self.year,
options[:month] || self.month,
options[:day] || options[:mday] || self.day # mday is deprecated
)
end
# Returns a new Date/DateTime representing the time a number of specified months ago
def months_ago(months)
months_since(-months)
end
def months_since(months)
year, month, day = self.year, self.month, self.day
month += months
# in case months is negative
while month < 1
month += 12
year -= 1
end
# in case months is positive
while month > 12
month -= 12
year += 1
end
max = ::Time.days_in_month(month, year)
day = max if day > max
change(:year => year, :month => month, :day => day)
end
# Returns a new Date/DateTime representing the time a number of specified years ago
def years_ago(years)
change(:year => self.year - years)
end
def years_since(years)
change(:year => self.year + years)
end
# Short-hand for years_ago(1)
def last_year
years_ago(1)
end
# Short-hand for years_since(1)
def next_year
years_since(1)
end
# Short-hand for months_ago(1)
def last_month
months_ago(1)
end
# Short-hand for months_since(1)
def next_month
months_since(1)
end
# Returns a new Date/DateTime representing the "start" of this week (i.e, Monday; DateTime objects will have time set to 0:00)
def beginning_of_week
days_to_monday = self.wday!=0 ? self.wday-1 : 6
result = self - days_to_monday
self.acts_like?(:time) ? result.midnight : result
end
alias :monday :beginning_of_week
alias :at_beginning_of_week :beginning_of_week
# Returns a new Date/DateTime representing the start of the given day in next week (default is Monday).
def next_week(day = :monday)
days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2, :thursday => 3, :friday => 4, :saturday => 5, :sunday => 6}
result = (self + 7).beginning_of_week + days_into_week[day]
self.acts_like?(:time) ? result.change(:hour => 0) : result
end
# Returns a new ; DateTime objects will have time set to 0:00DateTime representing the start of the month (1st of the month; DateTime objects will have time set to 0:00)
def beginning_of_month
self.acts_like?(:time) ? change(:day => 1,:hour => 0, :min => 0, :sec => 0) : change(:day => 1)
end
alias :at_beginning_of_month :beginning_of_month
# Returns a new Date/DateTime representing the end of the month (last day of the month; DateTime objects will have time set to 0:00)
def end_of_month
last_day = ::Time.days_in_month( self.month, self.year )
self.acts_like?(:time) ? change(:day => last_day,:hour => 0, :min => 0, :sec => 0) : change(:day => last_day)
end
alias :at_end_of_month :end_of_month
# Returns a new Date/DateTime representing the start of the quarter (1st of january, april, july, october; DateTime objects will have time set to 0:00)
def beginning_of_quarter
beginning_of_month.change(:month => [10, 7, 4, 1].detect { |m| m <= self.month })
end
alias :at_beginning_of_quarter :beginning_of_quarter
# Returns a new Date/DateTime representing the start of the year (1st of january; DateTime objects will have time set to 0:00)
def beginning_of_year
self.acts_like?(:time) ? change(:month => 1, :day => 1, :hour => 0, :min => 0, :sec => 0) : change(:month => 1, :day => 1)
end
alias :at_beginning_of_year :beginning_of_year
# Convenience method which returns a new Date/DateTime representing the time 1 day ago
def yesterday
self - 1
end
# Convenience method which returns a new Date/DateTime representing the time 1 day since the instance time
def tomorrow
self + 1
end
end
end
end
end
end
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