class Time

# File time.rb, line 555
def httpdate(date)
  if date.match?(/\A\s*
      (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\x20
      (\d{2})\x20
      (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
      (\d{4})\x20
      (\d{2}):(\d{2}):(\d{2})\x20
      GMT
      \s*\z/ix)
    self.rfc2822(date).utc
  elsif /\A\s*
         (?:Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday),\x20
         (\d\d)-(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-(\d\d)\x20
         (\d\d):(\d\d):(\d\d)\x20
         GMT
         \s*\z/ix =~ date
    year = $3.to_i
    if year < 50
      year += 2000
    else
      year += 1900
    end
    self.utc(year, $2, $1.to_i, $4.to_i, $5.to_i, $6.to_i)
  elsif /\A\s*
         (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\x20
         (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
         (\d\d|\x20\d)\x20
         (\d\d):(\d\d):(\d\d)\x20
         (\d{4})
         \s*\z/ix =~ date
    self.utc($6.to_i, MonthValue[$1.upcase], $2.to_i,
             $3.to_i, $4.to_i, $5.to_i)
  else
    raise ArgumentError.new("not RFC 2616 compliant date: #{date.inspect}")
  end
end

# File time.rb, line 370
def parse(date, now=self.now)
  comp = !block_given?
  d = Date._parse(date, comp)
  year = d[:year]
  year = yield(year) if year && !comp
  make_time(date, year, d[:yday], d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
end

# File time.rb, line 497
def rfc2822(date)
  if /\A\s*
      (?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\s*,\s*)?
      (\d{1,2})\s+
      (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+
      (\d{2,})\s+
      (\d{2})\s*
      :\s*(\d{2})\s*
      (?::\s*(\d{2}))?\s+
      ([+-]\d{4}|
       UT|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-IK-Z])/ix =~ date
    # Since RFC 2822 permit comments, the regexp has no right anchor.
    day = $1.to_i
    mon = MonthValue[$2.upcase]
    year = $3.to_i
    short_year_p = $3.length <= 3
    hour = $4.to_i
    min = $5.to_i
    sec = $6 ? $6.to_i : 0
    zone = $7

    if short_year_p
      # following year completion is compliant with RFC 2822.
      year = if year < 50
               2000 + year
             else
               1900 + year
             end
    end

    off = zone_offset(zone)
    year, mon, day, hour, min, sec =
      apply_offset(year, mon, day, hour, min, sec, off)
    t = self.utc(year, mon, day, hour, min, sec)
    force_zone!(t, zone, off)
    t
  else
    raise ArgumentError.new("not RFC 2822 compliant date: #{date.inspect}")
  end
end

# File time.rb, line 445
def strptime(date, format, now=self.now)
  d = Date._strptime(date, format)
  raise ArgumentError, "invalid date or strptime format - `#{date}' `#{format}'" unless d
  if seconds = d[:seconds]
    if sec_fraction = d[:sec_fraction]
      usec = sec_fraction * 1000000
      usec *= -1 if seconds < 0
    else
      usec = 0
    end
    t = Time.at(seconds, usec)
    if zone = d[:zone]
      force_zone!(t, zone)
    end
  else
    year = d[:year]
    year = yield(year) if year && block_given?
    yday = d[:yday]
    if (d[:cwyear] && !year) || ((d[:cwday] || d[:cweek]) && !(d[:mon] && d[:mday]))
      # make_time doesn't deal with cwyear/cwday/cweek
      return Date.strptime(date, format).to_time
    end
    if (d[:wnum0] || d[:wnum1]) && !yday && !(d[:mon] && d[:mday])
      yday = Date.strptime(date, format).yday
    end
    t = make_time(date, year, yday, d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
  end
  t
end

# File time.rb, line 609
def xmlschema(date)
  if /\A\s*
      (-?\d+)-(\d\d)-(\d\d)
      T
      (\d\d):(\d\d):(\d\d)
      (\.\d+)?
      (Z|[+-]\d\d(?::?\d\d)?)?
      \s*\z/ix =~ date
    year = $1.to_i
    mon = $2.to_i
    day = $3.to_i
    hour = $4.to_i
    min = $5.to_i
    sec = $6.to_i
    usec = 0
    if $7
      usec = Rational($7) * 1000000
    end
    if $8
      zone = $8
      off = zone_offset(zone)
      year, mon, day, hour, min, sec =
        apply_offset(year, mon, day, hour, min, sec, off)
      t = self.utc(year, mon, day, hour, min, sec, usec)
      force_zone!(t, zone, off)
      t
    else
      self.local(year, mon, day, hour, min, sec, usec)
    end
  else
    raise ArgumentError.new("invalid date: #{date.inspect}")
  end
end

# File time.rb, line 78
def zone_offset(zone, year=self.now.year)
  off = nil
  zone = zone.upcase
  if /\A([+-])(\d\d)(:?)(\d\d)(?:\3(\d\d))?\z/ =~ zone
    off = ($1 == '-' ? -1 : 1) * (($2.to_i * 60 + $4.to_i) * 60 + $5.to_i)
  elsif zone.match?(/\A[+-]\d\d\z/)
    off = zone.to_i * 3600
  elsif ZoneOffset.include?(zone)
    off = ZoneOffset[zone] * 3600
  elsif ((t = self.local(year, 1, 1)).zone.upcase == zone rescue false)
    off = t.utc_offset
  elsif ((t = self.local(year, 7, 1)).zone.upcase == zone rescue false)
    off = t.utc_offset
  end
  off
end

# File time.rb, line 148
def apply_offset(year, mon, day, hour, min, sec, off)
  if off < 0
    off = -off
    off, o = off.divmod(60)
    if o != 0 then sec += o; o, sec = sec.divmod(60); off += o end
    off, o = off.divmod(60)
    if o != 0 then min += o; o, min = min.divmod(60); off += o end
    off, o = off.divmod(24)
    if o != 0 then hour += o; o, hour = hour.divmod(24); off += o end
    if off != 0
      day += off
      days = month_days(year, mon)
      if days and days < day
        mon += 1
        if 12 < mon
          mon = 1
          year += 1
        end
        day = 1
      end
    end
  elsif 0 < off
    off, o = off.divmod(60)
    if o != 0 then sec -= o; o, sec = sec.divmod(60); off -= o end
    off, o = off.divmod(60)
    if o != 0 then min -= o; o, min = min.divmod(60); off -= o end
    off, o = off.divmod(24)
    if o != 0 then hour -= o; o, hour = hour.divmod(24); off -= o end
    if off != 0 then
      day -= off
      if day < 1
        mon -= 1
        if mon < 1
          year -= 1
          mon = 12
        end
        day = month_days(year, mon)
      end
    end
  end
  return year, mon, day, hour, min, sec
end

# File time.rb, line 119
def force_zone!(t, zone, offset=nil)
  if zone_utc?(zone)
    t.utc
  elsif offset ||= zone_offset(zone)
    # Prefer the local timezone over the fixed offset timezone because
    # the former is a real timezone and latter is an artificial timezone.
    t.localtime
    if t.utc_offset != offset
      # Use the fixed offset timezone only if the local timezone cannot
      # represent the given offset.
      t.localtime(offset)
    end
  else
    t.localtime
  end
end

# File time.rb, line 192
def make_time(date, year, yday, mon, day, hour, min, sec, sec_fraction, zone, now)
  if !year && !yday && !mon && !day && !hour && !min && !sec && !sec_fraction
    raise ArgumentError, "no time information in #{date.inspect}"
  end

  off = nil
  if year || now
    off_year = year || now.year
    off = zone_offset(zone, off_year) if zone
  end

  if yday
    unless (1..366) === yday
      raise ArgumentError, "yday #{yday} out of range"
    end
    mon, day = (yday-1).divmod(31)
    mon += 1
    day += 1
    t = make_time(date, year, nil, mon, day, hour, min, sec, sec_fraction, zone, now)
    diff = yday - t.yday
    return t if diff.zero?
    day += diff
    if day > 28 and day > (mday = month_days(off_year, mon))
      if (mon += 1) > 12
        raise ArgumentError, "yday #{yday} out of range"
      end
      day -= mday
    end
    return make_time(date, year, nil, mon, day, hour, min, sec, sec_fraction, zone, now)
  end

  if now and now.respond_to?(:getlocal)
    if off
      now = now.getlocal(off) if now.utc_offset != off
    else
      now = now.getlocal
    end
  end

  usec = nil
  usec = sec_fraction * 1000000 if sec_fraction

  if now
    begin
      break if year; year = now.year
      break if mon; mon = now.mon
      break if day; day = now.day
      break if hour; hour = now.hour
      break if min; min = now.min
      break if sec; sec = now.sec
      break if sec_fraction; usec = now.tv_usec
    end until true
  end

  year ||= 1970
  mon ||= 1
  day ||= 1
  hour ||= 0
  min ||= 0
  sec ||= 0
  usec ||= 0

  if year != off_year
    off = nil
    off = zone_offset(zone, year) if zone
  end

  if off
    year, mon, day, hour, min, sec =
      apply_offset(year, mon, day, hour, min, sec, off)
    t = self.utc(year, mon, day, hour, min, sec, usec)
    force_zone!(t, zone, off)
    t
  else
    self.local(year, mon, day, hour, min, sec, usec)
  end
end

# File time.rb, line 139
def month_days(y, m)
  if ((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0)
    LeapYearMonthDays[m-1]
  else
    CommonYearMonthDays[m-1]
  end
end

# File time.rb, line 95
def zone_utc?(zone)
  # * +0000
  #   In RFC 2822, +0000 indicate a time zone at Universal Time.
  #   Europe/Lisbon is "a time zone at Universal Time" in Winter.
  #   Atlantic/Reykjavik is "a time zone at Universal Time".
  #   Africa/Dakar is "a time zone at Universal Time".
  #   So +0000 is a local time such as Europe/London, etc.
  # * GMT
  #   GMT is used as a time zone abbreviation in Europe/London,
  #   Africa/Dakar, etc.
  #   So it is a local time.
  #
  # * -0000, -00:00
  #   In RFC 2822, -0000 the date-time contains no information about the
  #   local time zone.
  #   In RFC 3339, -00:00 is used for the time in UTC is known,
  #   but the offset to local time is unknown.
  #   They are not appropriate for specific time zone such as
  #   Europe/London because time zone neutral,
  #   So -00:00 and -0000 are treated as UTC.
  zone.match?(/\A(?:-00:00|-0000|-00|UTC|Z|UT)\z/i)
end

# File time.rb, line 701
def httpdate
  t = dup.utc
  sprintf('%s, %02d %s %0*d %02d:%02d:%02d GMT',
    RFC2822_DAY_NAME[t.wday],
    t.day, RFC2822_MONTH_NAME[t.mon-1], t.year < 0 ? 5 : 4, t.year,
    t.hour, t.min, t.sec)
end

# File time.rb, line 661
def rfc2822
  sprintf('%s, %02d %s %0*d %02d:%02d:%02d ',
    RFC2822_DAY_NAME[wday],
    day, RFC2822_MONTH_NAME[mon-1], year < 0 ? 5 : 4, year,
    hour, min, sec) <<
  if utc?
    '-0000'
  else
    off = utc_offset
    sign = off < 0 ? '-' : '+'
    sprintf('%s%02d%02d', sign, *(off.abs / 60).divmod(60))
  end
end

# File time.rb, line 730
def xmlschema(fraction_digits=0)
  fraction_digits = fraction_digits.to_i
  s = strftime("%FT%T")
  if fraction_digits > 0
    s << strftime(".%#{fraction_digits}N")
  end
  s << (utc? ? 'Z' : strftime("%:z"))
end