diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,8 @@
+zip-archive 0.3.3
+
+  * Remove dependency on old-time (typedrat).
+  * Drop splitBase flag and support for base versions < 3.
+
 zip-archive 0.3.2.5
 
   * Move 'build-tools: unzip' from library stanza to test stanza.
diff --git a/src/Codec/Archive/Zip.hs b/src/Codec/Archive/Zip.hs
--- a/src/Codec/Archive/Zip.hs
+++ b/src/Codec/Archive/Zip.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE ViewPatterns #-}
 ------------------------------------------------------------------------
 -- |
 -- Module      : Codec.Archive.Zip
@@ -65,10 +66,10 @@
 
        ) where
 
-import System.Time ( toUTCTime, addToClockTime, CalendarTime (..), ClockTime (..), TimeDiff (..) )
-#if MIN_VERSION_directory(1,2,0)
-import Data.Time.Clock.POSIX ( utcTimeToPOSIXSeconds )
-#endif
+import Data.Time.Calendar ( toGregorian, fromGregorian )
+import Data.Time.Clock ( UTCTime(..) )
+import Data.Time.Clock.POSIX ( posixSecondsToUTCTime, utcTimeToPOSIXSeconds )
+import Data.Time.LocalTime ( TimeOfDay(..), timeToTimeOfDay )
 import Data.Bits ( shiftL, shiftR, (.&.) )
 import Data.Binary
 import Data.Binary.Get
@@ -292,12 +293,8 @@
                         return B.empty
                       else
                         B.fromStrict <$> S.readFile path
-#if MIN_VERSION_directory(1,2,0)
   modEpochTime <- fmap (floor . utcTimeToPOSIXSeconds)
                    $ getModificationTime path
-#else
-  (TOD modEpochTime _) <- getModificationTime path
-#endif
   let entry = toEntry path' modEpochTime contents
 
   entryE <-
@@ -485,9 +482,14 @@
   epochTimeToMSDOSDateTime minMSDOSDateTime
   -- if time is earlier than minimum DOS datetime, return minimum
 epochTimeToMSDOSDateTime epochtime =
-  let ut = toUTCTime (TOD epochtime 0)
-      dosTime = toEnum $ (ctSec ut `div` 2) + shiftL (ctMin ut) 5 + shiftL (ctHour ut) 11
-      dosDate = toEnum $ ctDay ut + shiftL (fromEnum (ctMonth ut) + 1) 5 + shiftL (ctYear ut - 1980) 9
+  let 
+    UTCTime
+      (toGregorian -> (fromInteger -> year, month, day))
+      (timeToTimeOfDay -> (TimeOfDay hour minutes (floor -> sec))) 
+      = posixSecondsToUTCTime (fromIntegral epochtime)
+
+    dosTime = toEnum $ (sec `div` 2) + shiftL minutes 5 + shiftL hour 11
+    dosDate = toEnum $ day + shiftL month 5 + shiftL (year - 1980) 9
   in  MSDOSDateTime { msDOSDate = dosDate, msDOSTime = dosTime }
 
 -- | Convert a MSDOS datetime to a 'ClockTime'.
@@ -497,18 +499,10 @@
       minutes = fromIntegral $ (shiftR dosTime 5) .&. 0O77
       hour    = fromIntegral $ shiftR dosTime 11
       day     = fromIntegral $ dosDate .&. 0O37
-      month   = fromIntegral $ ((shiftR dosDate 5) .&. 0O17) - 1
+      month   = fromIntegral $ ((shiftR dosDate 5) .&. 0O17)
       year    = fromIntegral $ shiftR dosDate 9
-      timeSinceEpoch = TimeDiff
-               { tdYear = year + 10, -- dos times since 1980, unix epoch starts 1970
-                 tdMonth = month,
-                 tdDay = day - 1,  -- dos days start from 1
-                 tdHour = hour,
-                 tdMin = minutes,
-                 tdSec = seconds,
-                 tdPicosec = 0 }
-      (TOD epochsecs _) = addToClockTime timeSinceEpoch (TOD 0 0)
-  in  epochsecs
+      utc = UTCTime (fromGregorian (1980 + year) month day) (3600 * hour + 60 * minutes + seconds)
+  in floor (utcTimeToPOSIXSeconds utc)
 
 #ifndef _WINDOWS
 getDirectoryContentsRecursive' :: [ZipOption] -> FilePath -> IO [FilePath]
diff --git a/zip-archive.cabal b/zip-archive.cabal
--- a/zip-archive.cabal
+++ b/zip-archive.cabal
@@ -1,5 +1,5 @@
 Name:                zip-archive
-Version:             0.3.2.5
+Version:             0.3.3
 Cabal-Version:       >= 1.10
 Build-type:          Custom
 Synopsis:            Library for creating and modifying zip archives.
@@ -24,21 +24,24 @@
   type:              git
   location:          git://github.com/jgm/zip-archive.git
 
-flag splitBase
-  Description:       Choose the new, smaller, split-up base package.
-  Default:           True
 flag executable
   Description:       Build the Zip executable.
   Default:           False
 
 Library
-  if flag(splitBase)
-    Build-depends:   base >= 3 && < 5, pretty, containers
-  else
-    Build-depends:   base < 3
-  Build-depends:     binary >= 0.6, zlib, filepath, bytestring >= 0.10.0,
-                     array, mtl, text >= 0.11, old-time, digest >= 0.0.0.1,
-                     directory, time
+  Build-depends:     base >= 3 && < 5,
+                     pretty,
+                     containers,
+                     binary >= 0.6,
+                     zlib,
+                     filepath,
+                     bytestring >= 0.10.0,
+                     array,
+                     mtl,
+                     text >= 0.11,
+                     digest >= 0.0.0.1,
+                     directory >= 1.2.0,
+                     time
   Exposed-modules:   Codec.Archive.Zip
   Default-Language:  Haskell98
   Hs-Source-Dirs:    src
@@ -58,7 +61,9 @@
     Buildable:       False
   Main-is:           Main.hs
   Hs-Source-Dirs:    .
-  Build-Depends:     base >= 4.2 && < 5, directory >= 1.1, bytestring >= 0.9.0,
+  Build-Depends:     base >= 4.2 && < 5,
+                     directory >= 1.1,
+                     bytestring >= 0.9.0,
                      zip-archive
   Other-Modules:     Paths_zip_archive
   Ghc-Options:       -Wall
@@ -69,7 +74,7 @@
   Main-Is:        test-zip-archive.hs
   Hs-Source-Dirs: tests
   Build-Depends:  base >= 4.2 && < 5,
-                  directory >= 1.3, bytestring >= 0.9.0, process, time, old-time, 
+                  directory >= 1.3, bytestring >= 0.9.0, process, time,
                   HUnit, zip-archive, temporary, filepath
   Default-Language:  Haskell98
   Ghc-Options:    -Wall