diff --git a/lib/date/format.rb b/lib/date/format.rb
index 6894e94..268d945 100644
--- a/lib/date/format.rb
+++ b/lib/date/format.rb
@@ -108,28 +108,6 @@ class Date
     [MONTHS, DAYS, ABBR_MONTHS, ABBR_DAYS, ZONES].each do |x|
       x.freeze
     end
-
-    class BagStruct < Struct # :nodoc:
-
-      def to_hash
-	h = {}
-	members.each do |k|
-	  unless /\A_/ =~ k.to_s || self[k].nil?
-	    h[k] = self[k]
-	  end
-	end
-	h
-      end
-
-    end
-
-    Bag = BagStruct.new(:year, :mon, :yday, :mday, :wday,
-			:cwyear, :cweek, :cwday,
-			:hour, :min, :sec, :sec_fraction,
-			:wnum0, :wnum1, :seconds,
-			:zone, :offset, :leftover,
-			:_cent, :_merid, :_comp)
-
   end
 
   def emit(e, f) # :nodoc:
@@ -398,20 +376,20 @@ class Date
 			str.sub!(/\A(#{Format::ABBR_DAYS.keys.join('|')})/io, '')
 	  val = Format::DAYS[$1.downcase] || Format::ABBR_DAYS[$1.downcase]
 	  return unless val
-	  e.wday = val
+	  e[:wday] = val
 	when 'B', 'b', 'h'
 	  return unless str.sub!(/\A(#{Format::MONTHS.keys.join('|')})/io, '') ||
 			str.sub!(/\A(#{Format::ABBR_MONTHS.keys.join('|')})/io, '')
 	  val = Format::MONTHS[$1.downcase] || Format::ABBR_MONTHS[$1.downcase]
 	  return unless val
-	  e.mon = val
+	  e[:mon] = val
 	when 'C', 'EC'
 	  return unless str.sub!(if num_pattern?($')
 				 then /\A([-+]?\d{1,2})/
 				 else /\A([-+]?\d{1,})/
 				 end, '')
 	  val = $1.to_i
-	  e._cent = val
+	  e[:_][:cent] = val
 	when 'c', 'Ec'
 	  return unless _strptime_i(str, '%a %b %e %H:%M:%S %Y', e)
 	when 'D'
@@ -420,7 +398,7 @@ class Date
 	  return unless str.sub!(/\A( \d|\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (1..31) === val
-	  e.mday = val
+	  e[:mday] = val
 	when 'F'
 	  return unless _strptime_i(str, '%Y-%m-%d', e)
 	when 'G'
@@ -429,28 +407,28 @@ class Date
 				 else /\A([-+]?\d{1,})/
 				 end, '')
 	  val = $1.to_i
-	  e.cwyear = val
+	  e[:cwyear] = val
 	when 'g'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..99) === val
-	  e.cwyear = val
-	  e._cent ||= if val >= 69 then 19 else 20 end
+	  e[:cwyear] = val
+	  e[:_][:cent] ||= if val >= 69 then 19 else 20 end
 	when 'H', 'k', 'OH'
 	  return unless str.sub!(/\A( \d|\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..24) === val
-	  e.hour = val
+	  e[:hour] = val
 	when 'I', 'l', 'OI'
 	  return unless str.sub!(/\A( \d|\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (1..12) === val
-	  e.hour = val
+	  e[:hour] = val
 	when 'j'
 	  return unless str.sub!(/\A(\d{1,3})/, '')
 	  val = $1.to_i
 	  return unless (1..366) === val
-	  e.yday = val
+	  e[:yday] = val
 	when 'L'
 	  return unless str.sub!(if num_pattern?($')
 				 then /\A([-+]?\d{1,3})/
@@ -458,17 +436,17 @@ class Date
 				 end, '')
 #	  val = Rational($1.to_i, 10**3)
 	  val = Rational($1.to_i, 10**$1.size)
-	  e.sec_fraction = val
+	  e[:sec_fraction] = val
 	when 'M', 'OM'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..59) === val
-	  e.min = val
+	  e[:min] = val
 	when 'm', 'Om'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (1..12) === val
-	  e.mon = val
+	  e[:mon] = val
 	when 'N'
 	  return unless str.sub!(if num_pattern?($')
 				 then /\A([-+]?\d{1,9})/
@@ -476,16 +454,16 @@ class Date
 				 end, '')
 #	  val = Rational($1.to_i, 10**9)
 	  val = Rational($1.to_i, 10**$1.size)
-	  e.sec_fraction = val
+	  e[:sec_fraction] = val
 	when 'n', 't'
 	  return unless _strptime_i(str, "\s", e)
 	when 'P', 'p'
 	  return unless str.sub!(/\A([ap])(?:m\b|\.m\.)/i, '')
-	  e._merid = if $1.downcase == 'a' then 0 else 12 end
+	  e[:_][:merid] = if $1.downcase == 'a' then 0 else 12 end
 	when 'Q'
 	  return unless str.sub!(/\A(-?\d{1,})/, '')
 	  val = Rational($1.to_i, 10**3)
-	  e.seconds = val
+	  e[:seconds] = val
 	when 'R'
 	  return unless _strptime_i(str, '%H:%M', e)
 	when 'r'
@@ -494,35 +472,35 @@ class Date
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..60) === val
-	  e.sec = val
+	  e[:sec] = val
 	when 's'
 	  return unless str.sub!(/\A(-?\d{1,})/, '')
 	  val = $1.to_i
-	  e.seconds = val
+	  e[:seconds] = val
 	when 'T'
 	  return unless _strptime_i(str, '%H:%M:%S', e)
 	when 'U', 'W', 'OU', 'OW'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..53) === val
-	  e.__send__(if s[-1,1] == 'U' then :wnum0= else :wnum1= end, val)
+	  e[s[-1,1] == 'U' ? :wnum0 : :wnum1] = val
 	when 'u', 'Ou'
 	  return unless str.sub!(/\A(\d{1})/, '')
 	  val = $1.to_i
 	  return unless (1..7) === val
-	  e.cwday = val
+	  e[:cwday] = val
 	when 'V', 'OV'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (1..53) === val
-	  e.cweek = val
+	  e[:cweek] = val
 	when 'v'
 	  return unless _strptime_i(str, '%e-%b-%Y', e)
 	when 'w'
 	  return unless str.sub!(/\A(\d{1})/, '')
 	  val = $1.to_i
 	  return unless (0..6) === val
-	  e.wday = val
+	  e[:wday] = val
 	when 'X', 'EX'
 	  return unless _strptime_i(str, '%H:%M:%S', e)
 	when 'x', 'Ex'
@@ -533,22 +511,22 @@ class Date
 				 else /\A([-+]?\d{1,})/
 				 end, '')
 	  val = $1.to_i
-	  e.year = val
+	  e[:year] = val
 	when 'y', 'Ey', 'Oy'
 	  return unless str.sub!(/\A(\d{1,2})/, '')
 	  val = $1.to_i
 	  return unless (0..99) === val
-	  e.year = val
-	  e._cent ||= if val >= 69 then 19 else 20 end
+	  e[:year] = val
+	  e[:_][:cent] ||= if val >= 69 then 19 else 20 end
 	when 'Z', /\A:{0,3}z/
 	  return unless str.sub!(/\A((?:gmt|utc?)?[-+]\d+(?:[,.:]\d+(?::\d+)?)?
 				    |[[:alpha:].\s]+(?:standard|daylight)\s+time\b
 				    |[[:alpha:]]+(?:\s+dst)?\b
 				    )/ix, '')
 	  val = $1
-	  e.zone = val
+	  e[:zone] = val
 	  offset = zone_to_diff(val)
-	  e.offset = offset
+	  e[:offset] = offset
 	when '%'
 	  return unless str.sub!(/\A%/, '')
 	when '+'
@@ -571,30 +549,31 @@ class Date
 
   def self._strptime(str, fmt='%F')
     str = str.dup
-    e = Format::Bag.new
+    e = {:_ => {}}
     return unless _strptime_i(str, fmt, e)
 
-    if e._cent
-      if e.cwyear
-	e.cwyear += e._cent * 100
+    if e[:_][:cent]
+      if e[:cwyear]
+	e[:cwyear] += e[:_][:cent] * 100
       end
-      if e.year
-	e.  year += e._cent * 100
+      if e[:year]
+	e[:year] += e[:_][:cent] * 100
       end
     end
 
-    if e._merid
-      if e.hour
-	e.hour %= 12
-	e.hour += e._merid
+    if e[:_][:merid]
+      if e[:hour]
+	e[:hour] %= 12
+	e[:hour] += e[:_][:merid]
       end
     end
 
     unless str.empty?
-      e.leftover = str
+      e[:leftover] = str
     end
 
-    e.to_hash
+    e.delete(:_)
+    e
   end
 
   def self.s3e(e, y, m, d, bc=false)
@@ -645,21 +624,21 @@ class Date
       if bc
 	iy = -iy + 1
       end
-      e.year = iy
+      e[:year] = iy
     end
 
     if m
       m =~ /\d+/
-      e.mon = $&.to_i
+      e[:mon] = $&.to_i
     end
 
     if d
       d =~ /\d+/
-      e.mday = $&.to_i
+      e[:mday] = $&.to_i
     end
 
     if c != nil
-      e._comp = c
+      e[:_][:comp] = c
     end
 
   end
@@ -668,11 +647,11 @@ class Date
 
   def self._parse_day(str, e) # :nodoc:
     if str.sub!(/\b(#{Format::ABBR_DAYS.keys.join('|')})[^-\d\s]*/io, ' ')
-      e.wday = Format::ABBR_DAYS[$1.downcase]
+      e[:wday] = Format::ABBR_DAYS[$1.downcase]
       true
 =begin
     elsif str.sub!(/\b(?!\dth)(su|mo|tu|we|th|fr|sa)\b/i, ' ')
-      e.wday = %w(su mo tu we th fr sa).index($1.downcase)
+      e[:wday] = %w(su mo tu we th fr sa).index($1.downcase)
       true
 =end
     end
@@ -710,7 +689,7 @@ class Date
 		' ')
 
       t = $1
-      e.zone = $2 if $2
+      e[:zone] = $2 if $2
 
       t =~ /\A(\d+)h?
 	      (?:\s*:?\s*(\d+)m?
@@ -720,15 +699,15 @@ class Date
 	      )?
 	    (?:\s*([ap])(?:m\b|\.m\.))?/ix
 
-      e.hour = $1.to_i
-      e.min = $2.to_i if $2
-      e.sec = $3.to_i if $3
-      e.sec_fraction = Rational($4.to_i, 10**$4.size) if $4
+      e[:hour] = $1.to_i
+      e[:min] = $2.to_i if $2
+      e[:sec] = $3.to_i if $3
+      e[:sec_fraction] = Rational($4.to_i, 10**$4.size) if $4
 
       if $5
-	e.hour %= 12
+	e[:hour] %= 12
 	if $5.downcase == 'p'
-	  e.hour += 12
+	  e[:hour] += 12
 	end
       end
       true
@@ -742,11 +721,11 @@ class Date
       beat += Rational($2.to_i, 10**$2.size) if $2
       secs = Rational(beat, 1000)
       h, min, s, fr = self.day_fraction_to_time(secs)
-      e.hour = h
-      e.min = min
-      e.sec = s
-      e.sec_fraction = fr * 86400
-      e.zone = '+01:00'
+      e[:hour] = h
+      e[:min] = min
+      e[:sec] = s
+      e[:sec_fraction] = fr * 86400
+      e[:zone] = '+01:00'
       true
     end
   end
@@ -799,29 +778,29 @@ class Date
 
   def self._parse_iso2(str, e) # :nodoc:
     if str.sub!(/\b(\d{2}|\d{4})?-?w(\d{2})(?:-?(\d))?\b/i, ' ')
-      e.cwyear = $1.to_i if $1
-      e.cweek = $2.to_i
-      e.cwday = $3.to_i if $3
+      e[:cwyear] = $1.to_i if $1
+      e[:cweek] = $2.to_i
+      e[:cwday] = $3.to_i if $3
       true
     elsif str.sub!(/-w-(\d)\b/i, ' ')
-      e.cwday = $1.to_i
+      e[:cwday] = $1.to_i
       true
     elsif str.sub!(/--(\d{2})?-(\d{2})\b/, ' ')
-      e.mon = $1.to_i if $1
-      e.mday = $2.to_i
+      e[:mon] = $1.to_i if $1
+      e[:mday] = $2.to_i
       true
     elsif str.sub!(/--(\d{2})(\d{2})?\b/, ' ')
-      e.mon = $1.to_i
-      e.mday = $2.to_i if $2
+      e[:mon] = $1.to_i
+      e[:mday] = $2.to_i if $2
       true
     elsif /[,.](\d{2}|\d{4})-\d{3}\b/ !~ str &&
 	str.sub!(/\b(\d{2}|\d{4})-(\d{3})\b/, ' ')
-      e.year = $1.to_i
-      e.yday = $2.to_i
+      e[:year] = $1.to_i
+      e[:yday] = $2.to_i
       true
     elsif /\d-\d{3}\b/ !~ str &&
 	str.sub!(/\b-(\d{3})\b/, ' ')
-      e.yday = $1.to_i
+      e[:yday] = $1.to_i
       true
     end
   end
@@ -833,9 +812,9 @@ class Date
 	      's'=>1925,
 	      'h'=>1988
 	  }[$1.downcase]
-      e.year = $2.to_i + era
-      e.mon = $3.to_i
-      e.mday = $4.to_i
+      e[:year] = $2.to_i + era
+      e[:mon] = $3.to_i
+      e[:mday] = $4.to_i
       true
     end
   end
@@ -868,21 +847,21 @@ class Date
 
   def self._parse_year(str, e) # :nodoc:
     if str.sub!(/'(\d+)\b/, ' ')
-      e.year = $1.to_i
+      e[:year] = $1.to_i
       true
     end
   end
 
   def self._parse_mon(str, e) # :nodoc:
     if str.sub!(/\b(#{Format::ABBR_MONTHS.keys.join('|')})\S*/io, ' ')
-      e.mon = Format::ABBR_MONTHS[$1.downcase]
+      e[:mon] = Format::ABBR_MONTHS[$1.downcase]
       true
     end
   end
 
   def self._parse_mday(str, e) # :nodoc:
     if str.sub!(/(\d+)(st|nd|rd|th)\b/i, ' ')
-      e.mday = $1.to_i
+      e[:mday] = $1.to_i
       true
     end
   end
@@ -911,109 +890,109 @@ class Date
       case $2.size
       when 2
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
+	  e[:sec]  = $2[-2, 2].to_i
 	else
-	  e.mday = $2[ 0, 2].to_i
+	  e[:mday] = $2[ 0, 2].to_i
 	end
       when 4
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-4, 2].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-4, 2].to_i
 	else
-	  e.mon  = $2[ 0, 2].to_i
-	  e.mday = $2[ 2, 2].to_i
+	  e[:mon]  = $2[ 0, 2].to_i
+	  e[:mday] = $2[ 2, 2].to_i
 	end
       when 6
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-4, 2].to_i
-	  e.hour = $2[-6, 2].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-4, 2].to_i
+	  e[:hour] = $2[-6, 2].to_i
 	else
-	  e.year = ($1 + $2[ 0, 2]).to_i
-	  e.mon  = $2[ 2, 2].to_i
-	  e.mday = $2[ 4, 2].to_i
+	  e[:year] = ($1 + $2[ 0, 2]).to_i
+	  e[:mon]  = $2[ 2, 2].to_i
+	  e[:mday] = $2[ 4, 2].to_i
 	end
       when 8, 10, 12, 14
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-4, 2].to_i
-	  e.hour = $2[-6, 2].to_i
-	  e.mday = $2[-8, 2].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-4, 2].to_i
+	  e[:hour] = $2[-6, 2].to_i
+	  e[:mday] = $2[-8, 2].to_i
 	  if $2.size >= 10
-	    e.mon  = $2[-10, 2].to_i
+	    e[:mon]  = $2[-10, 2].to_i
 	  end
 	  if $2.size == 12
-	    e.year = ($1 + $2[-12, 2]).to_i
+	    e[:year] = ($1 + $2[-12, 2]).to_i
 	  end
 	  if $2.size == 14
-	    e.year = ($1 + $2[-14, 4]).to_i
-	    e._comp = false
+	    e[:year] = ($1 + $2[-14, 4]).to_i
+	    e[:_][:comp] = false
 	  end
 	else
-	  e.year = ($1 + $2[ 0, 4]).to_i
-	  e.mon  = $2[ 4, 2].to_i
-	  e.mday = $2[ 6, 2].to_i
-	  e.hour = $2[ 8, 2].to_i if $2.size >= 10
-	  e.min  = $2[10, 2].to_i if $2.size >= 12
-	  e.sec  = $2[12, 2].to_i if $2.size >= 14
-	  e._comp = false
+	  e[:year] = ($1 + $2[ 0, 4]).to_i
+	  e[:mon]  = $2[ 4, 2].to_i
+	  e[:mday] = $2[ 6, 2].to_i
+	  e[:hour] = $2[ 8, 2].to_i if $2.size >= 10
+	  e[:min]  = $2[10, 2].to_i if $2.size >= 12
+	  e[:sec]  = $2[12, 2].to_i if $2.size >= 14
+	  e[:_][:comp] = false
 	end
       when 3
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-3, 1].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-3, 1].to_i
 	else
-	  e.yday = $2[ 0, 3].to_i
+	  e[:yday] = $2[ 0, 3].to_i
 	end
       when 5
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-4, 2].to_i
-	  e.hour = $2[-5, 1].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-4, 2].to_i
+	  e[:hour] = $2[-5, 1].to_i
 	else
-	  e.year = ($1 + $2[ 0, 2]).to_i
-	  e.yday = $2[ 2, 3].to_i
+	  e[:year] = ($1 + $2[ 0, 2]).to_i
+	  e[:yday] = $2[ 2, 3].to_i
 	end
       when 7
 	if $3.nil? && $4
-	  e.sec  = $2[-2, 2].to_i
-	  e.min  = $2[-4, 2].to_i
-	  e.hour = $2[-6, 2].to_i
-	  e.mday = $2[-7, 1].to_i
+	  e[:sec]  = $2[-2, 2].to_i
+	  e[:min]  = $2[-4, 2].to_i
+	  e[:hour] = $2[-6, 2].to_i
+	  e[:mday] = $2[-7, 1].to_i
 	else
-	  e.year = ($1 + $2[ 0, 4]).to_i
-	  e.yday = $2[ 4, 3].to_i
+	  e[:year] = ($1 + $2[ 0, 4]).to_i
+	  e[:yday] = $2[ 4, 3].to_i
 	end
       end
       if $3
 	if $4
 	  case $3.size
 	  when 2, 4, 6
-	    e.sec  = $3[-2, 2].to_i
-	    e.min  = $3[-4, 2].to_i if $3.size >= 4
-	    e.hour = $3[-6, 2].to_i if $3.size >= 6
+	    e[:sec]  = $3[-2, 2].to_i
+	    e[:min]  = $3[-4, 2].to_i if $3.size >= 4
+	    e[:hour] = $3[-6, 2].to_i if $3.size >= 6
 	  end
 	else
 	  case $3.size
 	  when 2, 4, 6
-	    e.hour = $3[ 0, 2].to_i
-	    e.min  = $3[ 2, 2].to_i if $3.size >= 4
-	    e.sec  = $3[ 4, 2].to_i if $3.size >= 6
+	    e[:hour] = $3[ 0, 2].to_i
+	    e[:min]  = $3[ 2, 2].to_i if $3.size >= 4
+	    e[:sec]  = $3[ 4, 2].to_i if $3.size >= 6
 	  end
 	end
       end
       if $4
-	e.sec_fraction = Rational($4.to_i, 10**$4.size)
+	e[:sec_fraction] = Rational($4.to_i, 10**$4.size)
       end
       if $5
-	e.zone = $5
-	if e.zone[0,1] == '['
-	  o, n, = e.zone[1..-2].split(':')
-	  e.zone = n || o
+	e[:zone] = $5
+	if e[:zone][0,1] == '['
+	  o, n, = e[:zone][1..-2].split(':')
+	  e[:zone] = n || o
 	  if /\A\d/ =~ o
 	    o = format('+%s', o)
 	  end
-	  e.offset = zone_to_diff(o)
+	  e[:offset] = zone_to_diff(o)
 	end
       end
       true
@@ -1028,10 +1007,7 @@ class Date
   def self._parse(str, comp=true)
     str = str.dup
 
-    e = Format::Bag.new
-
-    e._comp = comp
-
+    e = {:_ => {:comp => comp}}
     str.gsub!(/[^-+',.\/:@[:alnum:]\[\]]+/, ' ')
 
     _parse_time(str, e) # || _parse_beat(str, e)
@@ -1051,44 +1027,45 @@ class Date
     _parse_ddd(str, e)
 
     if str.sub!(/\b(bc\b|bce\b|b\.c\.|b\.c\.e\.)/i, ' ')
-      if e.year
-	e.year = -e.year + 1
+      if e[:year]
+	e[:year] = -e[:year] + 1
       end
     end
 
     if str.sub!(/\A\s*(\d{1,2})\s*\z/, ' ')
-      if e.hour && !e.mday
+      if e[:hour] && !e[:mday]
 	v = $1.to_i
 	if (1..31) === v
-	  e.mday = v
+	  e[:mday] = v
 	end
       end
-      if e.mday && !e.hour
+      if e[:mday] && !e[:hour]
 	v = $1.to_i
 	if (0..24) === v
-	  e.hour = v
+	  e[:hour] = v
 	end
       end
     end
 
-    if e._comp
-      if e.cwyear
-	if e.cwyear >= 0 && e.cwyear <= 99
-	  e.cwyear += if e.cwyear >= 69
+    if e[:_][:comp]
+      if e[:cwyear]
+	if e[:cwyear] >= 0 && e[:cwyear] <= 99
+	  e[:cwyear] += if e[:cwyear] >= 69
 		      then 1900 else 2000 end
 	end
       end
-      if e.year
-	if e.year >= 0 && e.year <= 99
-	  e.year += if e.year >= 69
+      if e[:year]
+	if e[:year] >= 0 && e[:year] <= 99
+	  e[:year] += if e[:year] >= 69
 		    then 1900 else 2000 end
 	end
       end
     end
 
-    e.offset ||= zone_to_diff(e.zone) if e.zone
+    e[:offset] ||= zone_to_diff(e[:zone]) if e[:zone]
 
-    e.to_hash
+    e.delete(:_)
+    e
   end
 
   def self._iso8601(str) # :nodoc:
@@ -1130,42 +1107,42 @@ class Date
 	(?:t
 	  (\d{2}):(\d{2}):(\d{2})(?:\.(\d+))?)?
 	(z|[-+]\d{2}:\d{2})?\s*\z/ix =~ str
-      e = Format::Bag.new
-      e.year = $1.to_i
-      e.mon = $2.to_i if $2
-      e.mday = $3.to_i if $3
-      e.hour = $4.to_i if $4
-      e.min = $5.to_i if $5
-      e.sec = $6.to_i if $6
-      e.sec_fraction = Rational($7.to_i, 10**$7.size) if $7
+      e = {}
+      e[:year] = $1.to_i
+      e[:mon] = $2.to_i if $2
+      e[:mday] = $3.to_i if $3
+      e[:hour] = $4.to_i if $4
+      e[:min] = $5.to_i if $5
+      e[:sec] = $6.to_i if $6
+      e[:sec_fraction] = Rational($7.to_i, 10**$7.size) if $7
       if $8
-	e.zone = $8
-	e.offset = zone_to_diff($8)
+	e[:zone] = $8
+	e[:offset] = zone_to_diff($8)
       end
-      e.to_hash
+      e
     elsif /\A\s*(\d{2}):(\d{2}):(\d{2})(?:\.(\d+))?
 	(z|[-+]\d{2}:\d{2})?\s*\z/ix =~ str
-      e = Format::Bag.new
-      e.hour = $1.to_i if $1
-      e.min = $2.to_i if $2
-      e.sec = $3.to_i if $3
-      e.sec_fraction = Rational($4.to_i, 10**$4.size) if $4
+      e = {}
+      e[:hour] = $1.to_i if $1
+      e[:min] = $2.to_i if $2
+      e[:sec] = $3.to_i if $3
+      e[:sec_fraction] = Rational($4.to_i, 10**$4.size) if $4
       if $5
-	e.zone = $5
-	e.offset = zone_to_diff($5)
+	e[:zone] = $5
+	e[:offset] = zone_to_diff($5)
       end
-      e.to_hash
+      e
     elsif /\A\s*(?:--(\d{2})(?:-(\d{2}))?|---(\d{2}))
 	(z|[-+]\d{2}:\d{2})?\s*\z/ix =~ str
-      e = Format::Bag.new
-      e.mon = $1.to_i if $1
-      e.mday = $2.to_i if $2
-      e.mday = $3.to_i if $3
+      e = {}
+      e[:mon] = $1.to_i if $1
+      e[:mday] = $2.to_i if $2
+      e[:mday] = $3.to_i if $3
       if $4
-	e.zone = $4
-	e.offset = zone_to_diff($4)
+	e[:zone] = $4
+	e[:offset] = zone_to_diff($4)
       end
-      e.to_hash
+      e
     end
   end