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module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Time #:nodoc:
# Enables the use of time calculations within Time itself
module Calculations
def self.included(base) #:nodoc:
base.extend(ClassMethods)
end
module ClassMethods
# Return the number of days in the given month. If a year is given,
# February will return the correct number of days for leap years.
# Otherwise, this method will always report February as having 28
# days.
def days_in_month(month, year=nil)
if month == 2
!year.nil? && (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)) ? 29 : 28
elsif month <= 7
month % 2 == 0 ? 30 : 31
else
month % 2 == 0 ? 31 : 30
end
end
end
# Seconds since midnight: Time.now.seconds_since_midnight
def seconds_since_midnight
self.hour.hours + self.min.minutes + self.sec + (self.usec/1.0e+6)
end
# Returns a new Time where one or more of the elements have been changed according to the +options+ parameter. The time options
# (hour, minute, sec, usec) reset cascadingly, so if only the hour is passed, then minute, sec, and usec is set to 0. If the hour and
# minute is passed, then sec and usec is set to 0.
def change(options)
::Time.send(
self.utc? ? :utc : :local,
options[:year] || self.year,
options[:month] || self.month,
options[:mday] || self.mday,
options[:hour] || self.hour,
options[:min] || (options[:hour] ? 0 : self.min),
options[:sec] || ((options[:hour] || options[:min]) ? 0 : self.sec),
options[:usec] || ((options[:hour] || options[:min] || options[:sec]) ? 0 : self.usec)
)
end
# Uses Date to provide precise Time 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]
change(options.merge(:year => d.year, :month => d.month, :mday => d.day))
end
# Returns a new Time representing the time a number of seconds ago, this is basically a wrapper around the Numeric extension
# Do not use this method in combination with x.months, use months_ago instead!
def ago(seconds)
seconds.until(self)
end
# Returns a new Time representing the time a number of seconds since the instance time, this is basically a wrapper around
#the Numeric extension. Do not use this method in combination with x.months, use months_since instead!
def since(seconds)
seconds.since(self)
end
alias :in :since
# Returns a new Time representing the time a number of specified months ago
def months_ago(months)
months_since(-months)
end
def months_since(months)
year, month, mday = self.year, self.month, self.mday
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)
mday = max if mday > max
change(:year => year, :month => month, :mday => mday)
end
# Returns a new Time 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 Time representing the "start" of this week (Monday, 0:00)
def beginning_of_week
days_to_monday = self.wday!=0 ? self.wday-1 : 6
(self - days_to_monday.days).midnight
end
alias :monday :beginning_of_week
alias :at_beginning_of_week :beginning_of_week
# Returns a new Time 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}
since(1.week).beginning_of_week.since(days_into_week[day].day).change(:hour => 0)
end
# Returns a new Time representing the start of the day (0:00)
def beginning_of_day
(self - self.seconds_since_midnight).change(:usec => 0)
end
alias :midnight :beginning_of_day
alias :at_midnight :beginning_of_day
alias :at_beginning_of_day :beginning_of_day
# Returns a new Time representing the start of the month (1st of the month, 0:00)
def beginning_of_month
#self - ((self.mday-1).days + self.seconds_since_midnight)
change(:mday => 1,:hour => 0, :min => 0, :sec => 0, :usec => 0)
end
alias :at_beginning_of_month :beginning_of_month
# Returns a new Time representing the end of the month (last day of the month, 0:00)
def end_of_month
#self - ((self.mday-1).days + self.seconds_since_midnight)
last_day = ::Time.days_in_month( self.month, self.year )
change(:mday => last_day,:hour => 0, :min => 0, :sec => 0, :usec => 0)
end
alias :at_end_of_month :end_of_month
# Returns a new Time representing the start of the quarter (1st of january, april, july, october, 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 Time representing the start of the year (1st of january, 0:00)
def beginning_of_year
change(:month => 1,:mday => 1,:hour => 0, :min => 0, :sec => 0, :usec => 0)
end
alias :at_beginning_of_year :beginning_of_year
# Convenience method which returns a new Time representing the time 1 day ago
def yesterday
self.ago(1.day)
end
# Convenience method which returns a new Time representing the time 1 day since the instance time
def tomorrow
self.since(1.day)
end
end
end
end
end
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