1 files changed, 37 insertions, 0 deletions
diff --git a/lib/http_date.ml b/lib/http_date.ml
new file mode 100644
index 0000000..38bda02
--- /dev/null
+++ b/lib/http_date.ml
@@ -0,0 +1,37 @@
+(* Taken from https://github.com/gopiandcode/ocamlot *)
+let parse_date = Parser.parse_date
+let parse_date_exn = Parser.parse_date_exn
+
+let to_utc_string t =
+  let www =
+    Ptime.weekday t |> function
+    | `Sat -> "Sat"
+    | `Fri -> "Fri"
+    | `Mon -> "Mon"
+    | `Wed -> "Wed"
+    | `Sun -> "Sun"
+    | `Tue -> "Tue"
+    | `Thu -> "Thu"
+  in
+  let (yyyy, mmm, dd), ((hh, mm, ss), _) = Ptime.to_date_time t in
+  let mmm =
+    match mmm with
+    | 1 -> "Jan"
+    | 2 -> "Feb"
+    | 3 -> "Mar"
+    | 4 -> "Apr"
+    | 5 -> "May"
+    | 6 -> "Jun"
+    | 7 -> "Jul"
+    | 8 -> "Aug"
+    | 9 -> "Sep"
+    | 10 -> "Oct"
+    | 11 -> "Nov"
+    | 12 -> "Dec"
+    | _ -> assert false
+  in
+  Printf.sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT" www dd mmm yyyy hh mm ss
+
+let%test "rev" =
+  List.equal Int.equal (List.rev [ 3; 2; 1 ]) [ 3; 2; 1 ]
+