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diff --git a/src/Util.hs b/src/Util.hs
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+{-# LANGUAGE DeriveFoldable #-}
+module Util (module Util, toList) where
+
+import Data.Foldable (toList)
+import Data.Word (Word8)
+
+
+data Snoc a = SnocNil | Snoc (Snoc a) a
+  deriving (Show, Foldable)
+
+-- | Time-of-day, in unspecified time zone
+data YMDHMS = YMDHMS {-# UNPACK #-} !YMD
+                     {-# UNPACK #-} !HMS
+  deriving (Show)
+
+-- | Calendar day
+data YMD = YMD {-# UNPACK #-} !Int
+               {-# UNPACK #-} !Word8  -- ^ 1-based
+               {-# UNPACK #-} !Word8
+  deriving (Show)
+
+-- | Time-of-day in seconds, in unspecified time zone
+data HMS = HMS {-# UNPACK #-} !Word8
+               {-# UNPACK #-} !Word8
+               {-# UNPACK #-} !Word8
+  deriving (Show)
+
+pad :: Show a => Char -> Int -> a -> String
+pad c w val =
+  let s = show val
+  in replicate (w - length s) c ++ s