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require 'rational'
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module DateTime #:nodoc:
# Enables the use of time calculations within DateTime itself
module Calculations
def self.included(base) #:nodoc:
base.extend ClassMethods
base.class_eval do
alias_method :compare_without_coercion, :<=>
alias_method :<=>, :compare_with_coercion
end
end
module ClassMethods
# DateTimes aren't aware of DST rules, so use a consistent non-DST offset when creating a DateTime with an offset in the local zone
def local_offset
::Time.local(2007).utc_offset.to_r / 86400
end
end
# Seconds since midnight: DateTime.now.seconds_since_midnight
def seconds_since_midnight
self.sec + (self.min * 60) + (self.hour * 3600)
end
# Returns a new DateTime where one or more of the elements have been changed according to the +options+ parameter. The time options
# (hour, minute, sec) reset cascadingly, so if only the hour is passed, then minute and sec is set to 0. If the hour and
# minute is passed, then sec is set to 0.
def change(options)
::DateTime.civil(
options[:year] || self.year,
options[:month] || self.month,
options[:day] || self.day,
options[:hour] || self.hour,
options[:min] || (options[:hour] ? 0 : self.min),
options[:sec] || ((options[:hour] || options[:min]) ? 0 : self.sec),
options[:offset] || self.offset,
options[:start] || self.start
)
end
# Uses Date to provide precise Time calculations for years, months, and days. The +options+ parameter takes a hash with
# any of these keys: :years, :months, :weeks, :days, :hours, :minutes, :seconds.
def advance(options)
d = to_date.advance(options)
datetime_advanced_by_date = change(:year => d.year, :month => d.month, :day => d.day)
seconds_to_advance = (options[:seconds] || 0) + (options[:minutes] || 0) * 60 + (options[:hours] || 0) * 3600
seconds_to_advance == 0 ? datetime_advanced_by_date : datetime_advanced_by_date.since(seconds_to_advance)
end
# Returns a new DateTime representing the time a number of seconds ago
# Do not use this method in combination with x.months, use months_ago instead!
def ago(seconds)
self.since(-seconds)
end
# Returns a new DateTime representing the time a number of seconds since the instance time
# Do not use this method in combination with x.months, use months_since instead!
def since(seconds)
self + Rational(seconds.round, 86400)
end
alias :in :since
# Returns a new DateTime representing the start of the day (0:00)
def beginning_of_day
change(:hour => 0)
end
alias :midnight :beginning_of_day
alias :at_midnight :beginning_of_day
alias :at_beginning_of_day :beginning_of_day
# Returns a new DateTime representing the end of the day (23:59:59)
def end_of_day
change(:hour => 23, :min => 59, :sec => 59)
end
# Adjusts DateTime to UTC by adding its offset value; offset is set to 0
#
# Example:
#
# DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)) # => Mon, 21 Feb 2005 10:11:12 -0600
# DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)).utc # => Mon, 21 Feb 2005 16:11:12 +0000
def utc
new_offset(0)
end
# Returns true if offset == 0
def utc?
offset == 0
end
# Returns the offset value in seconds
def utc_offset
(offset * 86400).to_i
end
# Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime
def compare_with_coercion(other)
other = other.comparable_time if other.respond_to?(:comparable_time)
other = other.to_datetime unless other.acts_like?(:date)
compare_without_coercion(other)
end
end
end
end
end
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