class Time

def ===(other)
  super || (self == Time && other.is_a?(ActiveSupport::TimeWithZone))
end

def acts_like_time?
  true
end

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.gregorian.advance(options)
  time_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?
    time_advanced_by_date
  else
    time_advanced_by_date.since(seconds_to_advance)
  end
end

def ago(seconds)
  since(-seconds)
end

def as_json(options = nil) #:nodoc:
  if ActiveSupport::JSON::Encoding.use_standard_json_time_format
    xmlschema(ActiveSupport::JSON::Encoding.time_precision)
  else
    %(#{strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)})
  end
end

def at_with_coercion(*args)
  return at_without_coercion(*args) if args.size != 1
  # Time.at can be called with a time or numerical value
  time_or_number = args.first
  if time_or_number.is_a?(ActiveSupport::TimeWithZone) || time_or_number.is_a?(DateTime)
    at_without_coercion(time_or_number.to_f).getlocal
  else
    at_without_coercion(time_or_number)
  end
end

def beginning_of_day
  change(hour: 0)
end

def beginning_of_hour
  change(min: 0)
end

def beginning_of_minute
  change(sec: 0)
end

def blank?
  false
end

def change(options)
  new_year   = options.fetch(:year, year)
  new_month  = options.fetch(:month, month)
  new_day    = options.fetch(:day, day)
  new_hour   = options.fetch(:hour, hour)
  new_min    = options.fetch(:min, options[:hour] ? 0 : min)
  new_sec    = options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec)
  new_offset = options.fetch(:offset, nil)
  if new_nsec = options[:nsec]
    raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
    new_usec = Rational(new_nsec, 1000)
  else
    new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
  end
  raise ArgumentError, "argument out of range" if new_usec >= 1000000
  new_sec += Rational(new_usec, 1000000)
  if new_offset
    ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, new_offset)
  elsif utc?
    ::Time.utc(new_year, new_month, new_day, new_hour, new_min, new_sec)
  elsif zone
    ::Time.local(new_year, new_month, new_day, new_hour, new_min, new_sec)
  else
    ::Time.new(new_year, new_month, new_day, new_hour, new_min, new_sec, utc_offset)
  end
end

def compare_with_coercion(other)
  # we're avoiding Time#to_datetime and Time#to_time because they're expensive
  if other.class == Time
    compare_without_coercion(other)
  elsif other.is_a?(Time)
    compare_without_coercion(other.to_time)
  else
    to_datetime <=> other
  end
end

def current
  ::Time.zone ? ::Time.zone.now : ::Time.now
end

def days_in_month(month, year = current.year)
  if month == 2 && ::Date.gregorian_leap?(year)
    29
  else
    COMMON_YEAR_DAYS_IN_MONTH[month]
  end
end

def days_in_year(year = current.year)
  days_in_month(2, year) + 337
end

def end_of_day
  change(
    hour: 23,
    min: 59,
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

def end_of_hour
  change(
    min: 59,
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

def end_of_minute
  change(
    sec: 59,
    usec: Rational(999999999, 1000)
  )
end

def eql_with_coercion(other)
  # if other is an ActiveSupport::TimeWithZone, coerce a Time instance from it so we can do eql? comparison
  other = other.comparable_time if other.respond_to?(:comparable_time)
  eql_without_coercion(other)
end

def find_zone(time_zone)
  find_zone!(time_zone) rescue nil
end

def find_zone!(time_zone)
  if !time_zone || time_zone.is_a?(ActiveSupport::TimeZone)
    time_zone
  else
    # Look up the timezone based on the identifier (unless we've been
    # passed a TZInfo::Timezone)
    unless time_zone.respond_to?(:period_for_local)
      time_zone = ActiveSupport::TimeZone[time_zone] || TZInfo::Timezone.get(time_zone)
    end
    # Return if a TimeZone instance, or wrap in a TimeZone instance if a TZInfo::Timezone
    if time_zone.is_a?(ActiveSupport::TimeZone)
      time_zone
    else
      ActiveSupport::TimeZone.create(time_zone.name, nil, time_zone)
    end
  end
rescue TZInfo::InvalidTimezoneIdentifier
  raise ArgumentError, "Invalid Timezone: #{time_zone}"
end

def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon)
end

def middle_of_day
  change(hour: 12)
end

def minus_with_coercion(other)
  other = other.comparable_time if other.respond_to?(:comparable_time)
  other.is_a?(DateTime) ? to_f - other.to_f : minus_without_coercion(other)
end

def minus_with_duration(other) #:nodoc:
  if ActiveSupport::Duration === other
    other.until(self)
  else
    minus_without_duration(other)
  end
end

def next_day(days = 1)
  advance(days: days)
end

def next_month(months = 1)
  advance(months: months)
end

def next_year(years = 1)
  advance(years: years)
end

def plus_with_duration(other) #:nodoc:
  if ActiveSupport::Duration === other
    other.since(self)
  else
    plus_without_duration(other)
  end
end

def prev_day(days = 1)
  advance(days: -days)
end

def prev_month(months = 1)
  advance(months: -months)
end

def prev_year(years = 1)
  advance(years: -years)
end

def rfc3339(str)
  parts = Date._rfc3339(str)
  raise ArgumentError, "invalid date" if parts.empty?
  Time.new(
    parts.fetch(:year),
    parts.fetch(:mon),
    parts.fetch(:mday),
    parts.fetch(:hour),
    parts.fetch(:min),
    parts.fetch(:sec) + parts.fetch(:sec_fraction, 0),
    parts.fetch(:offset)
  )
end

def sec_fraction
  subsec
end

def seconds_since_midnight
  to_i - change(hour: 0).to_i + (usec / 1.0e+6)
end

def seconds_until_end_of_day
  end_of_day.to_i - to_i
end

def since(seconds)
  self + seconds
rescue
  to_datetime.since(seconds)
end

def to_formatted_s(format = :default)
  if formatter = DATE_FORMATS[format]
    formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
  else
    to_default_s
  end
end

def to_time
  preserve_timezone ? self : getlocal
end

def use_zone(time_zone)
  new_zone = find_zone!(time_zone)
  begin
    old_zone, ::Time.zone = ::Time.zone, new_zone
    yield
  ensure
    ::Time.zone = old_zone
  end
end

def zone
  Thread.current[:time_zone] || zone_default
end

def zone=(time_zone)
  Thread.current[:time_zone] = find_zone!(time_zone)
end