diff --git a/ChangeLog b/ChangeLog
index 5dc0e0bb7d..0ead2b2b41 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Aug 17 23:45:40 2009  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* lib/date/delta.rb: removed require 'date'.  added to_c.
+
 Mon Aug 17 14:35:03 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (lex_get_str, lex_io_gets, rb_parser_compile_string):
diff --git a/lib/date/delta.rb b/lib/date/delta.rb
index 89034d5205..283faf6ac2 100644
--- a/lib/date/delta.rb
+++ b/lib/date/delta.rb
@@ -1,6 +1,5 @@
 # delta.rb: Written by Tadayoshi Funaba 2004-2009
 
-require 'date'
 require 'date/delta/parser'
 
 class Date
@@ -375,6 +374,7 @@ class Date
     def to_i() dx_conv0(:to_i) end
     def to_f() dx_conv0(:to_f) end
     def to_r() dx_conv0(:to_r) end
+    def to_c() @delta end
 
     alias_method :to_int, :to_i