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require 'active_support/duration'
class Date
class << self
# Returns a new Date representing the date 1 day ago (i.e. yesterday's date).
def yesterday
::Date.today.yesterday
end
# Returns a new Date representing the date 1 day after today (i.e. tomorrow's date).
def tomorrow
::Date.today.tomorrow
end
# Returns Time.zone.today when config.time_zone is set, otherwise just returns Date.today.
def current
::Time.zone_default ? ::Time.zone.today : ::Date.today
end
end
# Tells whether the Date object's date lies in the past
def past?
self < ::Date.current
end
# Tells whether the Date object's date is today
def today?
self.to_date == ::Date.current # we need the to_date because of DateTime
end
# Tells whether the Date object's date lies in the future
def future?
self > ::Date.current
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
def ago(seconds)
to_time.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)
# and then adds the specified number of seconds
def since(seconds)
to_time.since(seconds)
end
alias :in :since
# Converts Date to a Time (or DateTime if necessary) with the time portion set to the beginning of the day (0:00)
def beginning_of_day
to_time
end
alias :midnight :beginning_of_day
alias :at_midnight :beginning_of_day
alias :at_beginning_of_day :beginning_of_day
# Converts Date to a Time (or DateTime if necessary) with the time portion set to the end of the day (23:59:59)
def end_of_day
to_time.end_of_day
end
def plus_with_duration(other) #:nodoc:
if ActiveSupport::Duration === other
other.since(self)
else
plus_without_duration(other)
end
end
alias_method :plus_without_duration, :+
alias_method :+, :plus_with_duration
def minus_with_duration(other) #:nodoc:
if ActiveSupport::Duration === other
plus_with_duration(-other)
else
minus_without_duration(other)
end
end
alias_method :minus_without_duration, :-
alias_method :-, :minus_with_duration
# Provides precise Date calculations for years, months, and days. The +options+ parameter takes a hash with
# any of these keys: <tt>:years</tt>, <tt>:months</tt>, <tt>:weeks</tt>, <tt>:days</tt>.
def advance(options)
options = options.dup
d = self
d = d >> options.delete(:years) * 12 if options[:years]
d = d >> options.delete(:months) if options[:months]
d = d + options.delete(:weeks) * 7 if options[:weeks]
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, 1)
# 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] || self.day
)
end
# Returns a new Date/DateTime representing the time a number of specified months ago
def months_ago(months)
advance(:months => -months)
end
# Returns a new Date/DateTime representing the time a number of specified months in the future
def months_since(months)
advance(:months => months)
end
# Returns a new Date/DateTime representing the time a number of specified years ago
def years_ago(years)
advance(:years => -years)
end
# Returns a new Date/DateTime representing the time a number of specified years in the future
def years_since(years)
advance(:years => 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 unless method_defined?(:next_year)
# 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 unless method_defined?(:next_month)
# 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 end of this week (Sunday, DateTime objects will have time set to 23:59:59)
def end_of_week
days_to_sunday = self.wday!=0 ? 7-self.wday : 0
result = self + days_to_sunday.days
self.acts_like?(:time) ? result.end_of_day : result
end
alias :at_end_of_week :end_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 => 23, :min => 59, :sec => 59) : 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 end of the quarter (last day of march, june, september, december; DateTime objects will have time set to 23:59:59)
def end_of_quarter
beginning_of_month.change(:month => [3, 6, 9, 12].detect { |m| m >= self.month }).end_of_month
end
alias :at_end_of_quarter :end_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
# Returns a new Time representing the end of the year (31st of december; DateTime objects will have time set to 23:59:59)
def end_of_year
self.acts_like?(:time) ? change(:month => 12,:day => 31,:hour => 23, :min => 59, :sec => 59) : change(:month => 12, :day => 31)
end
alias :at_end_of_year :end_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
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