diff --git a/ChangeLog b/ChangeLog
index a4a004a522..3cf5ef5e53 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Mar 12 00:06:24 2011  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* ext/date/lib: moved from lib.
+
 Fri Mar 11 23:32:38 2011  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* lib/date/delta*: removed undocumented delta.
diff --git a/ext/.document b/ext/.document
index 6f4f668ddf..e1b8ae2549 100644
--- a/ext/.document
+++ b/ext/.document
@@ -3,6 +3,8 @@
 bigdecimal/bigdecimal.c
 bigdecimal/lib
 coverage/coverage.c
+date/date_core.c
+date/lib
 digest/digest.c
 etc/etc.c
 fcntl/fcntl.c
diff --git a/lib/date.rb b/ext/date/lib/date.rb
similarity index 100%
rename from lib/date.rb
rename to ext/date/lib/date.rb
diff --git a/lib/date/format.rb b/ext/date/lib/date/format.rb
similarity index 100%
rename from lib/date/format.rb
rename to ext/date/lib/date/format.rb
diff --git a/lib/.document b/lib/.document
index d3c4a1369b..6cedb1677f 100644
--- a/lib/.document
+++ b/lib/.document
@@ -16,9 +16,6 @@ cgi
 cgi.rb
 complex.rb
 csv.rb
-date
-date.rb
-date2.rb
 debug.rb
 delegate.rb
 drb
@@ -54,7 +51,6 @@ optparse
 optparse.rb
 ostruct.rb
 parsearg.rb
-parsedate.rb
 pathname.rb
 ping.rb
 pp.rb
diff --git a/lib/README b/lib/README
index a8bb9c8d3d..3a5a89c8d4 100644
--- a/lib/README
+++ b/lib/README
@@ -8,8 +8,6 @@ cgi/session.rb	CGI session class
 cmath.rb	math support for complex numbers
 complex.rb	includes cmath and set complex arithemtic as default (obsolete)
 csv.rb		CSV parser/generator
-date.rb		date object
-date/format.rb	date parsing and formatting
 debug.rb	ruby debugger
 delegate.rb	delegates messages to other object
 drb.rb		distributed Ruby