diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
index 7a4479b927..fb99452481 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
@@ -336,7 +336,7 @@ String format_time_zone_offset_string(double offset_nanoseconds)
         // a. Let fraction be nanoseconds, formatted as a nine-digit decimal number, padded to the left with zeroes if necessary.
         // b. Set fraction to the longest possible substring of fraction starting at position 0 and not ending with the code unit 0x0030 (DIGIT ZERO).
         // c. Let post be the string-concatenation of the code unit 0x003A (COLON), s, the code unit 0x002E (FULL STOP), and fraction.
-        builder.appendff(":{:02}.{:9}", seconds, nanoseconds);
+        builder.appendff(":{:02}.{}", seconds, String::formatted("{:09}", nanoseconds).trim("0"sv, TrimMode::Right));
     }
     // 12. Else if seconds ≠ 0, then
     else if (seconds != 0) {
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/TimeZone/TimeZone.prototype.toString.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/TimeZone/TimeZone.prototype.toString.js
index bfefb3ac93..2814b13c7e 100644
--- a/Userland/Libraries/LibJS/Tests/builtins/Temporal/TimeZone/TimeZone.prototype.toString.js
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/TimeZone/TimeZone.prototype.toString.js
@@ -4,8 +4,20 @@ describe("correct behavior", () => {
     });
 
     test("basic functionality", () => {
-        const timeZone = new Temporal.TimeZone("UTC");
-        expect(timeZone.toString()).toBe("UTC");
+        const values = [
+            ["utc", "UTC"],
+            ["Utc", "UTC"],
+            ["UTC", "UTC"],
+            ["+00:00", "+00:00"],
+            ["+00:00:00", "+00:00"],
+            ["+00:00:00.000", "+00:00"],
+            ["+12:34:56.789", "+12:34:56.789"],
+            ["+12:34:56.789000", "+12:34:56.789"],
+            ["-01:00", "-01:00"],
+        ];
+        for (const [arg, expected] of values) {
+            expect(new Temporal.TimeZone(arg).toString()).toBe(expected);
+        }
     });
 });