diff --git a/pandoc.cabal b/pandoc.cabal
index f25fceae2..9d598fdc3 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -202,7 +202,6 @@ Library
                  bytestring >= 0.9 && < 1.0,
                  zip-archive >= 0.1.1.7 && < 0.2,
                  utf8-string >= 0.3 && < 0.4,
-                 old-time >= 1 && < 1.2,
                  old-locale >= 1 && < 1.1,
                  time >= 1.2 && < 1.5,
                  HTTP >= 4000.0.5 && < 4000.3,
@@ -295,7 +294,6 @@ Executable pandoc
                  bytestring >= 0.9 && < 1.0,
                  zip-archive >= 0.1.1.7 && < 0.2,
                  utf8-string >= 0.3 && < 0.4,
-                 old-time >= 1 && < 1.2,
                  old-locale >= 1 && < 1.1,
                  time >= 1.2 && < 1.5,
                  HTTP >= 4000.0.5 && < 4000.3,
diff --git a/src/Text/Pandoc/Writers/Docx.hs b/src/Text/Pandoc/Writers/Docx.hs
index 218a6e42a..f29a0fe42 100644
--- a/src/Text/Pandoc/Writers/Docx.hs
+++ b/src/Text/Pandoc/Writers/Docx.hs
@@ -36,7 +36,7 @@ import Data.ByteString.Lazy.UTF8 ( fromString, toString )
 import Text.Pandoc.UTF8 as UTF8
 import System.IO ( stderr )
 import Codec.Archive.Zip
-import System.Time
+import Data.Time.Clock.POSIX
 import Paths_pandoc ( getDataFileName )
 import Text.Pandoc.Definition
 import Text.Pandoc.Generic
@@ -114,7 +114,7 @@ writeDocx mbRefDocx opts doc@(Pandoc (Meta tit auths date) _) = do
 
   (newContents, st) <- runStateT (writeOpenXML opts{writerWrapText = False} doc)
                        defaultWriterState
-  (TOD epochtime _) <- getClockTime
+  epochtime <- floor `fmap` getPOSIXTime
   let imgs = M.elems $ stImages st
   let imgPath ident img = "media/" ++ ident ++
                             case imageType img of
diff --git a/src/Text/Pandoc/Writers/EPUB.hs b/src/Text/Pandoc/Writers/EPUB.hs
index e78e79bb5..d509c6842 100644
--- a/src/Text/Pandoc/Writers/EPUB.hs
+++ b/src/Text/Pandoc/Writers/EPUB.hs
@@ -36,7 +36,7 @@ import System.FilePath ( (</>), (<.>), takeBaseName, takeExtension )
 import qualified Data.ByteString.Lazy as B
 import Data.ByteString.Lazy.UTF8 ( fromString )
 import Codec.Archive.Zip
-import System.Time
+import Data.Time.Clock.POSIX
 import Text.Pandoc.Shared hiding ( Element )
 import Text.Pandoc.Definition
 import Text.Pandoc.Generic
@@ -54,7 +54,7 @@ writeEPUB :: Maybe String   -- ^ EPUB stylesheet specified at command line
           -> Pandoc         -- ^ Document to convert
           -> IO B.ByteString
 writeEPUB mbStylesheet opts doc@(Pandoc meta _) = do
-  (TOD epochtime _) <- getClockTime
+  epochtime <- floor `fmap` getPOSIXTime
   let mkEntry path content = toEntry path epochtime content
   let opts' = opts{ writerEmailObfuscation = NoObfuscation
                   , writerStandalone = True
diff --git a/src/Text/Pandoc/Writers/ODT.hs b/src/Text/Pandoc/Writers/ODT.hs
index 5c6f22ec6..f8f22494f 100644
--- a/src/Text/Pandoc/Writers/ODT.hs
+++ b/src/Text/Pandoc/Writers/ODT.hs
@@ -34,7 +34,7 @@ import System.FilePath ( (</>), takeExtension )
 import qualified Data.ByteString.Lazy as B
 import Data.ByteString.Lazy.UTF8 ( fromString )
 import Codec.Archive.Zip
-import System.Time
+import Data.Time.Clock.POSIX
 import Paths_pandoc ( getDataFileName )
 import Text.Pandoc.Shared ( WriterOptions(..) )
 import Text.Pandoc.ImageSize ( readImageSize, sizeInPoints )
@@ -72,7 +72,7 @@ writeODT mbRefOdt opts doc = do
   let sourceDir = writerSourceDirectory opts
   doc' <- bottomUpM (transformPic sourceDir picEntriesRef) doc
   let newContents = writeOpenDocument opts{writerWrapText = False} doc'
-  (TOD epochtime _) <- getClockTime
+  epochtime <- floor `fmap` getPOSIXTime
   let contentEntry = toEntry "content.xml" epochtime $ fromString newContents
   picEntries <- readIORef picEntriesRef
   let archive = foldr addEntryToArchive refArchive $ contentEntry : picEntries