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# frozen_string_literal: true
require "date"
class DateTime
class << self
# Returns <tt>Time.zone.now.to_datetime</tt> when <tt>Time.zone</tt> or
# <tt>config.time_zone</tt> are set, otherwise returns
# <tt>Time.now.to_datetime</tt>.
def current
::Time.zone ? ::Time.zone.now.to_datetime : ::Time.now.to_datetime
end
end
# Returns the number of seconds since 00:00:00.
#
# DateTime.new(2012, 8, 29, 0, 0, 0).seconds_since_midnight # => 0
# DateTime.new(2012, 8, 29, 12, 34, 56).seconds_since_midnight # => 45296
# DateTime.new(2012, 8, 29, 23, 59, 59).seconds_since_midnight # => 86399
def seconds_since_midnight
sec + (min * 60) + (hour * 3600)
end
# Returns the number of seconds until 23:59:59.
#
# DateTime.new(2012, 8, 29, 0, 0, 0).seconds_until_end_of_day # => 86399
# DateTime.new(2012, 8, 29, 12, 34, 56).seconds_until_end_of_day # => 41103
# DateTime.new(2012, 8, 29, 23, 59, 59).seconds_until_end_of_day # => 0
def seconds_until_end_of_day
end_of_day.to_i - to_i
end
# Returns the fraction of a second as a +Rational+
#
# DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)
def subsec
sec_fraction
end
# Returns a new DateTime where one or more of the elements have been changed
# according to the +options+ parameter. The time options (<tt>:hour</tt>,
# <tt>:min</tt>, <tt>:sec</tt>) 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. The +options+ parameter takes a hash with any of these
# keys: <tt>:year</tt>, <tt>:month</tt>, <tt>:day</tt>, <tt>:hour</tt>,
# <tt>:min</tt>, <tt>:sec</tt>, <tt>:offset</tt>, <tt>:start</tt>.
#
# DateTime.new(2012, 8, 29, 22, 35, 0).change(day: 1) # => DateTime.new(2012, 8, 1, 22, 35, 0)
# DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, day: 1) # => DateTime.new(1981, 8, 1, 22, 35, 0)
# DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, hour: 0) # => DateTime.new(1981, 8, 29, 0, 0, 0)
def change(options)
if new_nsec = options[:nsec]
raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
new_fraction = Rational(new_nsec, 1000000000)
else
new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
new_fraction = Rational(new_usec, 1000000)
end
raise ArgumentError, "argument out of range" if new_fraction >= 1
::DateTime.civil(
options.fetch(:year, year),
options.fetch(:month, month),
options.fetch(:day, day),
options.fetch(:hour, hour),
options.fetch(:min, options[:hour] ? 0 : min),
options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec) + new_fraction,
options.fetch(:offset, offset),
options.fetch(:start, 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: <tt>:years</tt>,
# <tt>:months</tt>, <tt>:weeks</tt>, <tt>:days</tt>, <tt>:hours</tt>,
# <tt>:minutes</tt>, <tt>:seconds</tt>.
def advance(options)
unless options[:weeks].nil?
options[:weeks], partial_weeks = options[:weeks].divmod(1)
options[:days] = options.fetch(:days, 0) + 7 * partial_weeks
end
unless options[:days].nil?
options[:days], partial_days = options[:days].divmod(1)
options[:hours] = options.fetch(:hours, 0) + 24 * partial_days
end
d = to_date.advance(options)
datetime_advanced_by_date = change(year: d.year, month: d.month, day: d.day)
seconds_to_advance = \
options.fetch(:seconds, 0) +
options.fetch(:minutes, 0) * 60 +
options.fetch(:hours, 0) * 3600
if seconds_to_advance.zero?
datetime_advanced_by_date
else
datetime_advanced_by_date.since(seconds_to_advance)
end
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)
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 middle of the day (12:00)
def middle_of_day
change(hour: 12)
end
alias :midday :middle_of_day
alias :noon :middle_of_day
alias :at_midday :middle_of_day
alias :at_noon :middle_of_day
alias :at_middle_of_day :middle_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, usec: Rational(999999999, 1000))
end
alias :at_end_of_day :end_of_day
# Returns a new DateTime representing the start of the hour (hh:00:00).
def beginning_of_hour
change(min: 0)
end
alias :at_beginning_of_hour :beginning_of_hour
# Returns a new DateTime representing the end of the hour (hh:59:59).
def end_of_hour
change(min: 59, sec: 59, usec: Rational(999999999, 1000))
end
alias :at_end_of_hour :end_of_hour
# Returns a new DateTime representing the start of the minute (hh:mm:00).
def beginning_of_minute
change(sec: 0)
end
alias :at_beginning_of_minute :beginning_of_minute
# Returns a new DateTime representing the end of the minute (hh:mm:59).
def end_of_minute
change(sec: 59, usec: Rational(999999999, 1000))
end
alias :at_end_of_minute :end_of_minute
# Returns a <tt>Time</tt> instance of the simultaneous time in the system timezone.
def localtime(utc_offset = nil)
utc = new_offset(0)
Time.utc(
utc.year, utc.month, utc.day,
utc.hour, utc.min, utc.sec + utc.sec_fraction
).getlocal(utc_offset)
end
alias_method :getlocal, :localtime
# Returns a <tt>Time</tt> instance of the simultaneous time in the UTC timezone.
#
# 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 UTC
def utc
utc = new_offset(0)
Time.utc(
utc.year, utc.month, utc.day,
utc.hour, utc.min, utc.sec + utc.sec_fraction
)
end
alias_method :getgm, :utc
alias_method :getutc, :utc
alias_method :gmtime, :utc
# Returns +true+ if <tt>offset == 0</tt>.
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 <=>(other)
if other.respond_to? :to_datetime
super other.to_datetime rescue nil
else
super
end
end
end
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