diff --git a/eternity-timestamped.cabal b/eternity-timestamped.cabal
--- a/eternity-timestamped.cabal
+++ b/eternity-timestamped.cabal
@@ -1,7 +1,7 @@
 name:
   eternity-timestamped
 version:
-  0.2.0.1
+  0.2.1
 synopsis:
   Automatic timestamping for Eternity
 category:
diff --git a/library/Eternity/Timestamped/Data/Conversion.hs b/library/Eternity/Timestamped/Data/Conversion.hs
--- a/library/Eternity/Timestamped/Data/Conversion.hs
+++ b/library/Eternity/Timestamped/Data/Conversion.hs
@@ -18,6 +18,9 @@
 timestampUtcTime :: Timestamp -> UTCTime
 timestampUtcTime = posixSecondsToUTCTime . timestampPosixTime
 
+timestampDay :: Timestamp -> Day
+timestampDay = utctDay . timestampUtcTime
+
 utcTimeTimestamp :: UTCTime -> Timestamp
 utcTimeTimestamp =
   posixTimeTimestamp . utcTimeToPOSIXSeconds
diff --git a/library/Eternity/Timestamped/Data/TypesAndInstances.hs b/library/Eternity/Timestamped/Data/TypesAndInstances.hs
--- a/library/Eternity/Timestamped/Data/TypesAndInstances.hs
+++ b/library/Eternity/Timestamped/Data/TypesAndInstances.hs
@@ -14,7 +14,8 @@
 Amount of microseconds since @1970-01-01 00:00.000000 UTC@.
 The semantics are the same as of 'Data.Time.Clock.POSIX.POSIXTime'.
 
-This datatype is used instead of 'UTCTime' for space-efficiency.
+This datatype is used instead of 'UTCTime' or 'Data.Time.Clock.POSIX.POSIXTime'
+for space-efficiency.
 -}
 newtype Timestamp = Timestamp Int64