192 lines
7.2 KiB
Ruby
192 lines
7.2 KiB
Ruby
module ActiveSupport #:nodoc:
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module CoreExtensions #:nodoc:
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module Time #:nodoc:
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# Enables the use of time calculations within Time itself
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module Calculations
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def self.included(base) #:nodoc:
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base.extend(ClassMethods)
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end
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module ClassMethods
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# Return the number of days in the given month. If a year is given,
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# February will return the correct number of days for leap years.
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# Otherwise, this method will always report February as having 28
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# days.
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def days_in_month(month, year=nil)
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if month == 2
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!year.nil? && (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)) ? 29 : 28
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elsif month <= 7
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month % 2 == 0 ? 30 : 31
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else
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month % 2 == 0 ? 31 : 30
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end
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end
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end
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# Seconds since midnight: Time.now.seconds_since_midnight
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def seconds_since_midnight
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self.to_i - self.change(:hour => 0).to_i + (self.usec/1.0e+6)
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end
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# Returns a new Time where one or more of the elements have been changed according to the +options+ parameter. The time options
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# (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
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# minute is passed, then sec and usec is set to 0.
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def change(options)
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::Time.send(
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self.utc? ? :utc : :local,
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options[:year] || self.year,
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options[:month] || self.month,
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options[:mday] || self.mday,
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options[:hour] || self.hour,
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options[:min] || (options[:hour] ? 0 : self.min),
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options[:sec] || ((options[:hour] || options[:min]) ? 0 : self.sec),
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options[:usec] || ((options[:hour] || options[:min] || options[:sec]) ? 0 : self.usec)
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)
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end
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# Uses Date to provide precise Time calculations for years, months, and days. The +options+ parameter takes a hash with
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# any of these keys: :months, :days, :years.
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def advance(options)
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d = ::Date.new(year + (options.delete(:years) || 0), month, day)
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d = d >> options.delete(:months) if options[:months]
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d = d + options.delete(:days) if options[:days]
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change(options.merge(:year => d.year, :month => d.month, :mday => d.day))
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end
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# Returns a new Time representing the time a number of seconds ago, this is basically a wrapper around the Numeric extension
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# Do not use this method in combination with x.months, use months_ago instead!
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def ago(seconds)
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self.since(-seconds)
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end
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# Returns a new Time representing the time a number of seconds since the instance time, this is basically a wrapper around
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#the Numeric extension. Do not use this method in combination with x.months, use months_since instead!
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def since(seconds)
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initial_dst = self.dst? ? 1 : 0
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f = seconds.since(self)
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final_dst = f.dst? ? 1 : 0
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(seconds.abs >= 86400 && initial_dst != final_dst) ? f + (initial_dst - final_dst).hours : f
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end
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alias :in :since
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# Returns a new Time representing the time a number of specified months ago
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def months_ago(months)
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months_since(-months)
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end
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def months_since(months)
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year, month, mday = self.year, self.month, self.mday
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month += months
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# in case months is negative
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while month < 1
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month += 12
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year -= 1
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end
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# in case months is positive
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while month > 12
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month -= 12
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year += 1
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end
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max = ::Time.days_in_month(month, year)
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mday = max if mday > max
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change(:year => year, :month => month, :mday => mday)
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end
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# Returns a new Time representing the time a number of specified years ago
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def years_ago(years)
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change(:year => self.year - years)
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end
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def years_since(years)
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change(:year => self.year + years)
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end
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# Short-hand for years_ago(1)
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def last_year
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years_ago(1)
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end
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# Short-hand for years_since(1)
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def next_year
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years_since(1)
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end
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# Short-hand for months_ago(1)
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def last_month
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months_ago(1)
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end
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# Short-hand for months_since(1)
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def next_month
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months_since(1)
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end
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# Returns a new Time representing the "start" of this week (Monday, 0:00)
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def beginning_of_week
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days_to_monday = self.wday!=0 ? self.wday-1 : 6
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(self - days_to_monday.days).midnight
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end
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alias :monday :beginning_of_week
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alias :at_beginning_of_week :beginning_of_week
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# Returns a new Time representing the start of the given day in next week (default is Monday).
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def next_week(day = :monday)
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days_into_week = { :monday => 0, :tuesday => 1, :wednesday => 2, :thursday => 3, :friday => 4, :saturday => 5, :sunday => 6}
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since(1.week).beginning_of_week.since(days_into_week[day].day).change(:hour => 0)
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end
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# Returns a new Time representing the start of the day (0:00)
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def beginning_of_day
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(self - self.seconds_since_midnight).change(:usec => 0)
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end
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alias :midnight :beginning_of_day
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alias :at_midnight :beginning_of_day
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alias :at_beginning_of_day :beginning_of_day
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# Returns a new Time representing the start of the month (1st of the month, 0:00)
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def beginning_of_month
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#self - ((self.mday-1).days + self.seconds_since_midnight)
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change(:mday => 1,:hour => 0, :min => 0, :sec => 0, :usec => 0)
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end
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alias :at_beginning_of_month :beginning_of_month
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# Returns a new Time representing the end of the month (last day of the month, 0:00)
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def end_of_month
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#self - ((self.mday-1).days + self.seconds_since_midnight)
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last_day = ::Time.days_in_month( self.month, self.year )
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change(:mday => last_day,:hour => 0, :min => 0, :sec => 0, :usec => 0)
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end
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alias :at_end_of_month :end_of_month
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# Returns a new Time representing the start of the quarter (1st of january, april, july, october, 0:00)
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def beginning_of_quarter
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beginning_of_month.change(:month => [10, 7, 4, 1].detect { |m| m <= self.month })
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end
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alias :at_beginning_of_quarter :beginning_of_quarter
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# Returns a new Time representing the start of the year (1st of january, 0:00)
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def beginning_of_year
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change(:month => 1,:mday => 1,:hour => 0, :min => 0, :sec => 0, :usec => 0)
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end
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alias :at_beginning_of_year :beginning_of_year
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# Convenience method which returns a new Time representing the time 1 day ago
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def yesterday
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self.ago(1.day)
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end
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# Convenience method which returns a new Time representing the time 1 day since the instance time
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def tomorrow
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self.since(1.day)
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end
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end
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end
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end
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end
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