diff --git a/Network/Wai/Logger/Date.hs b/Network/Wai/Logger/Date.hs
--- a/Network/Wai/Logger/Date.hs
+++ b/Network/Wai/Logger/Date.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DoAndIfThenElse, BangPatterns #-}
+{-# LANGUAGE CPP #-}
 
 module Network.Wai.Logger.Date (
     ZonedDate
@@ -13,14 +14,21 @@
 import Data.IORef
 import Data.Time
 import System.Locale
+#if WINDOWS
+#define TIME UTCTime
+#define GETTIME getCurrentTime
+#else
 import System.Posix (EpochTime, epochTime)
 import Data.Time.Clock.POSIX
+#define TIME EpochTime
+#define GETTIME epochTime
+#endif
 
 -- | A type for zoned date.
 type ZonedDate = ByteString
 
 data DateCache = DateCache {
-    unixTime :: !EpochTime
+    unixTime :: !TIME
   , zonedDate :: !ZonedDate
   }
 
@@ -30,7 +38,7 @@
 -- | Getting 'ZonedDate' from the 'ZonedDate' cache.
 getDate :: DateRef -> IO ZonedDate
 getDate (DateRef ref) = do
-    newEt <- epochTime
+    newEt <- GETTIME
     cache <- readIORef ref
     let oldEt = unixTime cache
     if oldEt == newEt then
@@ -40,13 +48,17 @@
         !_ <- atomicModifyIORef ref (\_ -> (newCache, ()))
         return $ zonedDate newCache
 
-newDate :: EpochTime -> IO DateCache
+newDate :: TIME -> IO DateCache
 newDate et = DateCache et . format <$> toZonedTime et
   where
     toZonedTime = utcToLocalZonedTime . toUTC
+#if WINDOWS
+    toUTC = id
+#else
     toUTC = posixSecondsToUTCTime . realToFrac
+#endif
     format = BS.pack . formatTime defaultTimeLocale "%d/%b/%Y:%T %z"
 
 -- | Initializing the 'ZonedDate' cache.
 dateInit :: IO DateRef
-dateInit = DateRef <$> (epochTime >>= newDate >>= newIORef)
+dateInit = DateRef <$> (GETTIME >>= newDate >>= newIORef)
diff --git a/wai-logger.cabal b/wai-logger.cabal
--- a/wai-logger.cabal
+++ b/wai-logger.cabal
@@ -1,5 +1,5 @@
 Name:                   wai-logger
-Version:                0.1.0
+Version:                0.1.1
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -16,10 +16,13 @@
                         Network.Wai.Logger.Format
                         Network.Wai.Logger.Utils
   Build-Depends:        base >= 4 && < 5, time, old-locale,
-                        unix, bytestring, blaze-builder,
+                        bytestring, blaze-builder,
                         wai, fast-logger, http-types, case-insensitive,
                         network, byteorder
+  if os(windows)
+    cpp-options: -DWINDOWS
+  else
+    build-depends: unix
 Source-Repository head
   Type:                 git
-  Location:             git://github.com/kazu-yamamoto/wai-logger.git
-
+  Location:             git://github.com/kazu-yamamoto/logger.git