diff --git a/src/tools/date-time-converter/date-time-converter.e2e.spec.ts b/src/tools/date-time-converter/date-time-converter.e2e.spec.ts
index 249dd754..dd5ed779 100644
--- a/src/tools/date-time-converter/date-time-converter.e2e.spec.ts
+++ b/src/tools/date-time-converter/date-time-converter.e2e.spec.ts
@@ -11,7 +11,7 @@ test.describe('Date time converter - json to yaml', () => {
 
   test('Format is auto detected from a date and the date is correctly converted', async ({ page }) => {
     const initialFormat = await page.getByTestId('date-time-converter-format-select').innerText();
-    expect(initialFormat.trim()).toEqual('Timestamp');
+    expect(initialFormat.trim()).toEqual('Unix timestamp');
 
     await page.getByTestId('date-time-converter-input').fill('2023-04-12T23:10:24+02:00');
 
@@ -22,6 +22,7 @@ test.describe('Date time converter - json to yaml', () => {
       'Wed Apr 12 2023 23:10:24 GMT+0200 (Central European Summer Time)',
     );
     expect((await page.getByTestId('ISO 8601').inputValue()).trim()).toEqual('2023-04-12T23:10:24+02:00');
+    expect((await page.getByTestId('ISO 8601 UTC').inputValue()).trim()).toEqual('2023-04-12T21:10:24.000Z');
     expect((await page.getByTestId('ISO 9075').inputValue()).trim()).toEqual('2023-04-12 23:10:24');
     expect((await page.getByTestId('Unix timestamp').inputValue()).trim()).toEqual('1681333824');
     expect((await page.getByTestId('RFC 7231').inputValue()).trim()).toEqual('Wed, 12 Apr 2023 21:10:24 GMT');
diff --git a/src/tools/date-time-converter/date-time-converter.models.test.ts b/src/tools/date-time-converter/date-time-converter.models.test.ts
index fb6cc63f..fca174cc 100644
--- a/src/tools/date-time-converter/date-time-converter.models.test.ts
+++ b/src/tools/date-time-converter/date-time-converter.models.test.ts
@@ -12,6 +12,7 @@ import {
   isRFC3339DateString,
   isRFC7231DateString,
   isTimestamp,
+  isTimestampMicroSeconds,
   isUTCDateString,
   isUnixTimestamp,
   toJSDate,
@@ -130,19 +131,18 @@ describe('date-time-converter models', () => {
 
   describe('isTimestampMicroSeconds', () => {
     test('should return true for valid Unix timestamps in microseconds', () => {
-      expect(isTimestamp('1649792026123123')).toBe(true);
-      expect(isTimestamp('1701227351995845')).toBe(true);
-      expect(isTimestamp('0')).toBe(true);
+      expect(isTimestampMicroSeconds('1649792026123123')).toBe(true);
+      expect(isTimestampMicroSeconds('1701227351995845')).toBe(true);
     });
 
     test('should return false for invalid Unix timestamps in microseconds', () => {
-      expect(isTimestamp('foo')).toBe(false);
-      expect(isTimestamp('')).toBe(false);
+      expect(isTimestampMicroSeconds('foo')).toBe(false);
+      expect(isTimestampMicroSeconds('')).toBe(false);
     });
 
     test('should return false for invalid Unix timestamps not in microseconds', () => {
-      expect(isTimestamp('170122735199584')).toBe(false);
-      expect(isTimestamp('17012273519958')).toBe(false);
+      expect(isTimestampMicroSeconds('170122735199584')).toBe(false);
+      expect(isTimestampMicroSeconds('17012273519958')).toBe(false);
     });
   });