diff --git a/Web/Twitter/Types/Lens.hs b/Web/Twitter/Types/Lens.hs
--- a/Web/Twitter/Types/Lens.hs
+++ b/Web/Twitter/Types/Lens.hs
@@ -243,7 +243,6 @@
        , imageSizeTypeType
 
        -- * Type aliases and sum types
-       , TT.DateString
        , TT.UserId
        , TT.Friends
        , TT.URIString
@@ -272,6 +271,7 @@
 
 import Control.Lens hiding (makeLenses)
 import Data.Text (Text)
+import Data.Time
 import qualified Web.Twitter.Types as TT
 import Web.Twitter.Types.Lens.TH
 
@@ -350,7 +350,7 @@
     screen_name = entityBody.userEntityUserScreenName
 
 class HasCreatedAt a where
-    created_at :: Lens' a TT.DateString
+    created_at :: Lens' a UTCTime
 instance HasCreatedAt TT.Status where
     created_at = statusCreatedAt
 instance HasCreatedAt TT.SearchStatus where
diff --git a/twitter-types-lens.cabal b/twitter-types-lens.cabal
--- a/twitter-types-lens.cabal
+++ b/twitter-types-lens.cabal
@@ -1,5 +1,5 @@
 name:                twitter-types-lens
-version:             0.6.0
+version:             0.7.0
 synopsis:            Twitter JSON types (lens powered)
 homepage:            https://github.com/himura/twitter-types-lens
 license:             BSD3
@@ -27,6 +27,7 @@
     , lens >= 4.0 && < 5
     , template-haskell
     , text
-    , twitter-types == 0.6.0
+    , time
+    , twitter-types >= 0.7 && < 0.8
 
   default-language:    Haskell2010