diff --git a/pkgs/development/ocaml-modules/iso8601/default.nix b/pkgs/development/ocaml-modules/iso8601/default.nix
new file mode 100644
index 00000000000..4b194332d08
--- /dev/null
+++ b/pkgs/development/ocaml-modules/iso8601/default.nix
@@ -0,0 +1,22 @@
+{ stdenv, fetchzip, ocaml, findlib }:
+
+let version = "0.2.4"; in
+
+stdenv.mkDerivation {
+  name = "ocaml-iso8601-${version}";
+  src = fetchzip {
+    url = "https://github.com/sagotch/ISO8601.ml/archive/${version}.tar.gz";
+    sha256 = "0ypdd1p04xdjxxx3b61wp7abswfrq3vcvwwaxvywxwqljw0dhydi";
+  };
+
+  buildInputs = [ ocaml findlib ];
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = http://sagotch.github.io/ISO8601.ml/;
+    description = "ISO 8601 and RFC 3999 date parsing for OCaml";
+    license = stdenv.lib.licenses.mit;
+    platforms = ocaml.meta.platforms;
+    maintainers = with stdenv.lib.maintainers; [ vbgl ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3107318c7dc..a6da7cf68ff 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4522,6 +4522,8 @@ let
 
     ipaddr = callPackage ../development/ocaml-modules/ipaddr { };
 
+    iso8601 = callPackage ../development/ocaml-modules/iso8601 { };
+
     javalib = callPackage ../development/ocaml-modules/javalib {
       extlib = ocaml_extlib_maximal;
     };