diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.from.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.from.js
index d5e14a4c9b..5a52b58e2c 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.from.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDate/PlainDate.from.js
@@ -54,5 +54,8 @@ describe("errors", () => {
         expect(() => {
             Temporal.PlainDate.from("-000000-01-01");
         }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
+        expect(() => {
+            Temporal.PlainDate.from("−000000-01-01"); // U+2212
+        }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
     });
 });
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.from.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.from.js
index e741713249..66cea37352 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.from.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainDateTime/PlainDateTime.from.js
@@ -191,5 +191,8 @@ describe("errors", () => {
         expect(() => {
             Temporal.PlainDateTime.from("-000000-01-01");
         }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
+        expect(() => {
+            Temporal.PlainDateTime.from("−000000-01-01"); // U+2212
+        }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
     });
 });
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.from.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.from.js
index ffffb51b8f..bedcd2952e 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.from.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainMonthDay/PlainMonthDay.from.js
@@ -80,5 +80,8 @@ describe("errors", () => {
         expect(() => {
             Temporal.PlainMonthDay.from("-000000-01-01");
         }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
+        expect(() => {
+            Temporal.PlainMonthDay.from("−000000-01-01"); // U+2212
+        }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
     });
 });
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.from.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.from.js
index afacf2096b..d223b2f07e 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.from.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.from.js
@@ -69,6 +69,9 @@ describe("errors", () => {
         expect(() => {
             Temporal.PlainTime.from("-000000-01-01T00:00:00");
         }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
+        expect(() => {
+            Temporal.PlainTime.from("−000000-01-01T00:00:00"); // U+2212
+        }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
     });
 
     test("ambiguous string must contain a time designator", () => {
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.from.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.from.js
index 5579e22244..62348189e2 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.from.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainYearMonth/PlainYearMonth.from.js
@@ -106,5 +106,8 @@ describe("errors", () => {
         expect(() => {
             Temporal.PlainYearMonth.from("-000000-01");
         }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
+        expect(() => {
+            Temporal.PlainYearMonth.from("−000000-01-01"); // U+2212
+        }).toThrowWithMessage(RangeError, "Invalid extended year, must not be negative zero");
     });
 });