diff --git a/CHANGELOG.md b/CHANGELOG.md
index abcfc3b81..4d54fd653 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,8 +29,9 @@ Language extensions:
 Library additions:
 
 * Additional file management operations in `base`
-* New modules in `contrib` for time (`System.Clock`); JSON (`Language.JSON.*`);
-  random numbers (`System.Random`)
+* New module in `base` for time (`System.Clock`)
+* New modules in `contrib` for JSON (`Language.JSON.*`); random numbers
+  (`System.Random`)
 
 Other improvements:
 
diff --git a/libs/base/base.ipkg b/libs/base/base.ipkg
index 6c7679910..f83345882 100644
--- a/libs/base/base.ipkg
+++ b/libs/base/base.ipkg
@@ -37,6 +37,7 @@ modules = Control.App,
 
           System,
           System.Concurrency.Raw,
+          System.Clock,
           System.Directory,
           System.File,
           System.FFI,
diff --git a/libs/contrib/System/Clock.idr b/libs/contrib/System/Clock.idr
deleted file mode 100644
index 7994b7c3a..000000000
--- a/libs/contrib/System/Clock.idr
+++ /dev/null
@@ -1,150 +0,0 @@
-module System.Clock
-
-import PrimIO
-
-||| The various types of system clock available.
-public export
-data ClockType
-  = UTC       -- The time elapsed since the "epoch:" 00:00:00 UTC, January 1, 1970
-  | Monotonic -- The time elapsed since some arbitrary point in the past
-  | Duration  -- Representing a time duration.
-  | Process   -- The amount of CPU time used by the current process.
-  | Thread    -- The amount of CPU time used by the current thread.
-  | GCCPU     -- The current process's CPU time consumed by the garbage collector.
-  | GCReal    -- The current process's real time consumed by the garbage collector.
-
-export
-Show ClockType where
-  show UTC       = "UTC"
-  show Monotonic = "monotonic"
-  show Duration  = "duration"
-  show Process   = "process"
-  show Thread    = "thread"
-  show GCCPU     = "gcCPU"
-  show GCReal    = "gcReal"
-
-public export
-data Clock : (type : ClockType) -> Type where
-  MkClock
-    : {type : ClockType}
-    -> (seconds : Integer)
-    -> (nanoseconds : Integer)
-    -> Clock type
-
-public export
-Eq (Clock type) where
-  (MkClock seconds1 nanoseconds1) == (MkClock seconds2 nanoseconds2) =
-    seconds1 == seconds2 && nanoseconds1 == nanoseconds2
-
-public export
-Ord (Clock type) where
-  compare (MkClock seconds1 nanoseconds1) (MkClock seconds2 nanoseconds2) =
-  case compare seconds1 seconds2 of
-    LT => LT
-    GT => GT
-    EQ => compare nanoseconds1 nanoseconds2
-
-public export
-Show (Clock type) where
-  show (MkClock {type} seconds nanoseconds) =
-    show type ++ ": " ++ show seconds ++ "s " ++ show nanoseconds ++ "ns"
-
-||| A helper to deconstruct a Clock.
-public export
-seconds : Clock type -> Integer
-seconds (MkClock s _) = s
-
-||| A helper to deconstruct a Clock.
-public export
-nanoseconds : Clock type -> Integer
-nanoseconds (MkClock _ ns) = ns
-
-||| Make a duration value.
-public export
-makeDuration : Integer -> Integer -> Clock Duration
-makeDuration = MkClock
-
-||| Opaque clock value manipulated by the back-end.
-data OSClock : Type where [external]
-
-||| Note: Back-ends are required to implement UTC, monotonic time, CPU time
-||| in current process/thread, and time duration; the rest are optional.
-data ClockTypeMandatory
-  = Mandatory
-  | Optional
-
-public export
-isClockMandatory : ClockType -> ClockTypeMandatory
-isClockMandatory GCCPU  = Optional
-isClockMandatory GCReal = Optional
-isClockMandatory _      = Mandatory
-
-prim_clockTimeMonotonic : IO OSClock
-prim_clockTimeMonotonic = schemeCall OSClock "blodwen-clock-time-monotonic" []
-
-fetchOSClock : ClockType -> IO OSClock
-fetchOSClock UTC       = schemeCall OSClock "blodwen-clock-time-utc" []
-fetchOSClock Monotonic = prim_clockTimeMonotonic
-fetchOSClock Process   = schemeCall OSClock "blodwen-clock-time-process" []
-fetchOSClock Thread    = schemeCall OSClock "blodwen-clock-time-thread" []
-fetchOSClock GCCPU     = schemeCall OSClock "blodwen-clock-time-gccpu" []
-fetchOSClock GCReal    = schemeCall OSClock "blodwen-clock-time-gcreal" []
-fetchOSClock Duration  = prim_clockTimeMonotonic
-
-||| A test to determine the status of optional clocks.
-osClockValid : OSClock -> IO Int
-osClockValid clk = schemeCall Int "blodwen-is-time?" [clk]
-
-fromOSClock : {type : ClockType} -> OSClock -> IO (Clock type)
-fromOSClock clk =
-  pure $
-    MkClock
-      {type}
-      !(schemeCall Integer "blodwen-clock-second" [clk])
-      !(schemeCall Integer "blodwen-clock-nanosecond" [clk])
-
-public export
-clockTimeReturnType : (typ : ClockType) -> Type
-clockTimeReturnType typ with (isClockMandatory typ)
-  clockTimeReturnType typ | Optional = Maybe (Clock typ)
-  clockTimeReturnType typ | Mandatory = Clock typ
-
-||| Fetch the system clock of a given kind. If the clock is mandatory,
-||| we return a (Clock type) else (Maybe (Clock type)).
-public export
-clockTime : (typ : ClockType) -> IO (clockTimeReturnType typ)
-clockTime clockType with (isClockMandatory clockType)
-  clockTime clockType | Mandatory = fetchOSClock clockType >>= fromOSClock
-  clockTime clockType | Optional = do
-    clk <- fetchOSClock clockType
-    valid <- map (== 1) $ osClockValid clk
-    if valid
-      then map Just $ fromOSClock clk
-      else pure Nothing
-
-toNano : Clock type -> Integer
-toNano (MkClock seconds nanoseconds) =
-  let scale = 1000000000
-   in scale * seconds + nanoseconds
-
-fromNano : {type : ClockType} -> Integer -> Clock type
-fromNano n =
-  let scale       = 1000000000
-      seconds     = n `div` scale
-      nanoseconds = n `mod` scale
-   in MkClock seconds nanoseconds
-
-||| Compute difference between two clocks of the same type.
-public export
-timeDifference : Clock type -> Clock type -> Clock Duration
-timeDifference clock duration = fromNano $ toNano clock - toNano duration
-
-||| Add a duration to a clock value.
-public export
-addDuration : {type : ClockType} -> Clock type -> Clock Duration -> Clock type
-addDuration clock duration = fromNano $ toNano clock + toNano duration
-
-||| Subtract a duration from a clock value.
-public export
-subtractDuration : {type : ClockType} -> Clock type -> Clock Duration -> Clock type
-subtractDuration clock duration = fromNano $ toNano clock - toNano duration
diff --git a/libs/contrib/contrib.ipkg b/libs/contrib/contrib.ipkg
index 631a5c4de..e64b4045e 100644
--- a/libs/contrib/contrib.ipkg
+++ b/libs/contrib/contrib.ipkg
@@ -25,7 +25,6 @@ modules = Control.Delayed,
           Text.Parser.Core,
           Text.Lexer.Core,
 
-          System.Clock,
           System.Random,
           System.Path,
           Syntax.WithProof,