diff --git a/src/http_info.ml b/src/http_info.ml
index 97b80e03..ad4fc4e7 100644
--- a/src/http_info.ml
+++ b/src/http_info.ml
@@ -83,7 +83,7 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
     | None -> denom_l
     | Some timestamp ->
         List.filter
-          (fun v -> Timestamp.geq v.Denomination.stamp_start timestamp)
+          (fun v -> Timestamp.compare timestamp v.Denomination.stamp_start <= 0)
           denom_l
   in
   let* denominations = Denomination.make_denom_group_sorted denom_l in
diff --git a/src/http_management.ml b/src/http_management.ml
index f1b67201..04fc9a51 100644
--- a/src/http_management.ml
+++ b/src/http_management.ml
@@ -122,7 +122,7 @@ module Auditors = struct
         Logs.info (fun m -> m "enabled auditor");
         ()
     | Some auditor ->
-        if Timestamp.geq auditor.last_change validity_start then
+        if Timestamp.compare validity_start auditor.last_change <= 0 then
           Error "replay detected on enable-auditor"
         else
           let+ () = Pg.update_auditor db_conn auditor |> unwrap_err_caqti in
@@ -157,7 +157,7 @@ module Auditors_disable = struct
     match opt with
     | None -> Error "auditor not found"
     | Some auditor -> (
-        if Timestamp.geq auditor.last_change validity_end then
+        if Timestamp.compare validity_end auditor.last_change <= 0 then
           Error "replay detected on disable-auditor"
         else
           match auditor.is_active with
@@ -384,7 +384,7 @@ module Wire = struct
         Logs.info (fun m -> m "added wire method");
         ()
     | Some (wire, _is_active, last_change) ->
-        if Timestamp.geq last_change validity_start then
+        if Timestamp.compare validity_start last_change <= 0 then
           Error "replay detected on enable-wire"
         else
           let+ () =
@@ -423,7 +423,7 @@ module Wire_disable = struct
     match opt with
     | None -> Error "wire not found"
     | Some (wire, _is_active, last_change) ->
-        if Timestamp.geq last_change validity_end then
+        if Timestamp.compare validity_end last_change <= 0 then
           Error "replay detected on disable-wire"
         else
           let+ () =
diff --git a/src/signkey.ml b/src/signkey.ml
index 78e4ea46..2f0763be 100644
--- a/src/signkey.ml
+++ b/src/signkey.ml
@@ -19,4 +19,5 @@ let verify_exchange_signing_key_validity ~key sk =
     }
 
 let is_valid_at ~timestamp sk =
-  Timestamp.geq sk.stamp_start timestamp && Timestamp.lt timestamp sk.stamp_end
+  Timestamp.compare sk.stamp_start timestamp <= 0
+  && Timestamp.compare timestamp sk.stamp_end < 0
diff --git a/src/time.ml b/src/time.ml
index b05cf5fb..634a9dff 100644
--- a/src/time.ml
+++ b/src/time.ml
@@ -97,10 +97,6 @@ module Timestamp = struct
   let never = uint64_max
   let zero = 0L
   let compare = Int64.unsigned_compare
-  let gt a b = compare a b > 0
-  let geq a b = compare a b >= 0
-  let lt a b = compare a b < 0
-  let leq a b = compare a b <= 0
   let equal a b = compare a b = 0
   let min a b = if compare a b < 0 then a else b
   let max a b = if compare a b > 0 then a else b
diff --git a/src/time.mli b/src/time.mli
index dc4bd841..a7c038b3 100644
--- a/src/time.mli
+++ b/src/time.mli
@@ -37,10 +37,6 @@ module Timestamp : sig
   val never : t
   val zero : t
   val compare : t -> t -> int
-  val gt : t -> t -> bool
-  val geq : t -> t -> bool
-  val lt : t -> t -> bool
-  val leq : t -> t -> bool
   val equal : t -> t -> bool
   val min : t -> t -> t
   val max : t -> t -> t