[bug#64400] [PATCH 1/5] gnu: Add ocaml-ISO8601.

["Anders Ågren Thuné" <anders@aathn.org>]

* gnu/packages/ocaml.scm (ocaml-ISO8601): New variable.
---
 gnu/packages/ocaml.scm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/gnu/packages/ocaml.scm b/gnu/packages/ocaml.scm
index ab0aa0574a..abdf09bdc1 100644
--- a/gnu/packages/ocaml.scm
+++ b/gnu/packages/ocaml.scm
@@ -29,6 +29,7 @@
 ;;; Copyright © 2022 Garek Dyszel <garekdyszel@disroot.org>
 ;;; Copyright © 2023 Csepp <raingloom@riseup.net>
 ;;; Copyright © 2023 Foundation Devices, Inc. <hello@foundationdevices.com>
+;;; Copyright © 2023 Anders Ågren Thuné <anders@aathn.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -2699,6 +2700,32 @@ (define-public ocaml-ppx-tools
 syntactic tools.")
     (license license:expat)))
 
+(define-public ocaml-ISO8601
+  ;; NOTE: Using commit from master branch as 0.2.6 uses the Pervasives
+  ;; module in its tests, which is incompatible with OCaml 5.0.
+  (let ((revision "0")
+        (commit "ad50cb01061405623c834608c26f1ef2d44f8340"))
+    (package
+      (name "ocaml-ISO8601")
+      (version (git-version "0.2.6" revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/ocaml-community/ISO8601.ml")
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "1lvjrxz66b7dv40cbl8xyfv3x8nmwj0m5ipfvxc37mjaaf3xrr5g"))))
+      (build-system dune-build-system)
+      (propagated-inputs (list ocaml-odoc))
+      (native-inputs (list ocaml-ounit))
+      (home-page "https://github.com/ocaml-community/ISO8601.ml/")
+      (synopsis "ISO 8601 and RFC 3339 date parsing for OCaml")
+      (description
+       "OCaml parser and printer for date-times in ISO8601 and RFC 3339")
+      (license license:expat))))
+
 (define-public ocaml-parmap
   (package
     (name "ocaml-parmap")
-- 
2.40.1