diff --git a/Network/HTTP/Date/Parser.hs b/Network/HTTP/Date/Parser.hs
--- a/Network/HTTP/Date/Parser.hs
+++ b/Network/HTTP/Date/Parser.hs
@@ -31,7 +31,9 @@
     sp
     (h,n,s) <- time
     sp
-    void $ string "GMT"
+    -- RFC 2616 defines GMT only but there are actually ill-formed ones such 
+    -- as "+0000" and "UTC" in the wild.
+    void $ string "GMT" <|> string "+0000" <|> string "UTC"
     return $ defaultHTTPDate {
         hdYear   = y
       , hdMonth  = m
diff --git a/http-date.cabal b/http-date.cabal
--- a/http-date.cabal
+++ b/http-date.cabal
@@ -1,5 +1,5 @@
 Name:                   http-date
-Version:                0.0.5
+Version:                0.0.6
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3