diff --git a/elm.json b/elm.json
index 672b5de..84431bd 100644
--- a/elm.json
+++ b/elm.json
@@ -15,6 +15,6 @@
         "elm/time": "1.0.0 <= v < 2.0.0"
     },
     "test-dependencies": {
-        "elm-explorations/test": "1.0.0 <= v < 2.0.0"
+        "elm-explorations/test": "2.0.0 <= v < 3.0.0"
     }
 }
diff --git a/src/Iso8601.elm b/src/Iso8601.elm
index 230559f..9633e34 100644
--- a/src/Iso8601.elm
+++ b/src/Iso8601.elm
@@ -342,7 +342,7 @@ utcOffsetInMinutes =
         utcOffsetMinutesFromParts : Int -> Int -> Int -> Int
         utcOffsetMinutesFromParts multiplier hours minutes =
             -- multiplier is either 1 or -1 (for negative UTC offsets)
-            multiplier * (hours * 60) + minutes
+            multiplier * ((hours * 60) + minutes)
     in
     Parser.succeed identity
         |= oneOf
diff --git a/tests/Example.elm b/tests/Example.elm
index 83c6590..11fc48b 100644
--- a/tests/Example.elm
+++ b/tests/Example.elm
@@ -3,9 +3,9 @@ module Example exposing (knownValues, reflexive)
 import Expect
 import Fuzz
 import Iso8601
+import Json.Decode exposing (decodeString, errorToString)
 import Test exposing (..)
 import Time
-import Json.Decode exposing (decodeString, errorToString)
 
 
 knownValues : Test
@@ -99,11 +99,20 @@ knownValues =
             \_ ->
                 Iso8601.toTime "2019-05-30T06:30"
                     |> Expect.equal (Ok (Time.millisToPosix 1559197800000))
+        , test "toTime supports negative timestamps (French Polynesia: Marquesas Islands)" <|
+            \_ ->
+                Iso8601.toTime "2022-11-21T00:00:00-09:30"
+                    |> Expect.equal (Ok (Time.millisToPosix 1669023000000))
+        , test "toTime supports negative timestamps (Canada: Newfoundland, Labrador (southeast))" <|
+            \_ ->
+                Iso8601.toTime "2022-11-21T00:00:00-03:30"
+                    |> Expect.equal (Ok (Time.millisToPosix 1669001400000))
         , test "decoder returns clearer error for dead ends" <|
             \_ ->
                 case decodeString Iso8601.decoder "2010-09-31T14:29:25.01235Z" of
                     Err error ->
                         Expect.notEqual (errorToString error) "TODO deadEndsToString"
+
                     Ok _ ->
                         Expect.fail "Should fail on dead ends"
         ]