diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff4e626ca..79e57f976 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@ Please see [CONTRIBUTING.md](./CONTRIBUTING.md) on how to contribute to Cucumber
 
 ## [Unreleased]
 
+### Added
+- Add the timestamp of the start time of the testsuite to the JUnit reporter ([#2443](https://github.com/cucumber/cucumber-js/pull/2443))
+
 ## [11.0.1] - 2024-09-14
 ### Fixed
 - Add missing setParallelCanAssign export ([#2427](https://github.com/cucumber/cucumber-js/pull/2427))
diff --git a/src/formatter/junit_formatter.ts b/src/formatter/junit_formatter.ts
index 03722198d..e0f6d73e3 100644
--- a/src/formatter/junit_formatter.ts
+++ b/src/formatter/junit_formatter.ts
@@ -9,7 +9,9 @@ import {
   Rule,
   TestStepResult,
   TestStepResultStatus,
+  TimeConversion,
 } from '@cucumber/messages'
+
 import { doesHaveValue } from '../value_checker'
 import { valueOrDefault } from '../value_checker'
 import { ITestCaseAttempt } from './helpers/event_data_collector'
@@ -26,6 +28,7 @@ interface IJUnitTestSuite {
   skipped: number
   time: number
   tests: IJUnitTestCase[]
+  timestamp?: string
 }
 
 interface IJUnitTestCase {
@@ -70,6 +73,7 @@ interface IBuildJUnitTestStepOptions {
 export default class JunitFormatter extends Formatter {
   private readonly names: Record<string, string[]> = {}
   private readonly suiteName: string
+  private testRunStarted?: messages.Timestamp
   public static readonly documentation: string = 'Outputs JUnit report'
 
   constructor(options: IFormatterOptions) {
@@ -79,6 +83,9 @@ export default class JunitFormatter extends Formatter {
       'cucumber-js'
     )
     options.eventBroadcaster.on('envelope', (envelope: messages.Envelope) => {
+      if (doesHaveValue(envelope.testRunStarted)) {
+        this.testRunStarted = envelope.testRunStarted.timestamp
+      }
       if (doesHaveValue(envelope.testRunFinished)) {
         this.onTestRunFinished()
       }
@@ -90,6 +97,15 @@ export default class JunitFormatter extends Formatter {
       .getTestCaseAttempts()
       .filter((attempt) => !attempt.willBeRetried)
   }
+  private getTimestamp(): string | undefined {
+    if (!this.testRunStarted) {
+      return undefined
+    }
+    const ms = TimeConversion.timestampToMillisecondsSinceEpoch(
+      this.testRunStarted
+    )
+    return new Date(ms).toISOString().slice(0, -5)
+  }
 
   private getTestSteps(
     testCaseAttempt: ITestCaseAttempt,
@@ -253,6 +269,7 @@ export default class JunitFormatter extends Formatter {
       failures,
       skipped,
       time: tests.reduce((total, test) => total + test.time, 0),
+      timestamp: this.getTimestamp(),
     }
 
     this.log(this.buildXmlReport(testSuite))
@@ -266,6 +283,9 @@ export default class JunitFormatter extends Formatter {
       .att('name', testSuite.name)
       .att('time', testSuite.time)
       .att('tests', testSuite.tests.length)
+    if (testSuite.timestamp) {
+      xmlReport.att('timestamp', testSuite.timestamp)
+    }
     testSuite.tests.forEach((test) => {
       const xmlTestCase = xmlReport.ele('testcase', {
         classname: test.classname,
diff --git a/src/formatter/junit_formatter_spec.ts b/src/formatter/junit_formatter_spec.ts
index a0721b3b3..f2194b452 100644
--- a/src/formatter/junit_formatter_spec.ts
+++ b/src/formatter/junit_formatter_spec.ts
@@ -76,7 +76,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0" tests="0"/>'
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0" tests="0" timestamp="1970-01-01T00:00:00"/>'
       )
     })
   })
@@ -112,7 +112,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
             '  </testcase>\n' +
@@ -147,7 +147,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <failure type="Error" message="error"><![CDATA[error]]></failure>\n' +
             '    <system-out><![CDATA[Given a failing step......................................................failed]]></system-out>\n' +
@@ -181,7 +181,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <failure type="Error" message="Error: include invalid character"><![CDATA[Error: include invalid character]]></failure>\n' +
             '    <system-out><![CDATA[Given a failing step with invalid character...............................failed]]></system-out>\n' +
@@ -218,7 +218,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <system-out><![CDATA[Given a flaky step........................................................passed]]></system-out>\n' +
             '  </testcase>\n' +
@@ -252,7 +252,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <failure/>\n' +
             '    <system-out><![CDATA[Given a pending step.....................................................pending]]></system-out>\n' +
@@ -289,7 +289,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="0" skipped="1" name="cucumber-js" time="0.001" tests="1">\n' +
+            '<testsuite failures="0" skipped="1" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
             '    <skipped/>\n' +
             '    <system-out><![CDATA[Given a passing step......................................................passed\n' +
@@ -324,7 +324,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0" tests="1">\n' +
+            '<testsuite failures="1" skipped="0" name="cucumber-js" time="0" tests="1" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my scenario" time="0">\n' +
             '    <failure/>\n' +
             '    <system-out><![CDATA[Given a passing step...................................................undefined]]></system-out>\n' +
@@ -366,7 +366,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="1">\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="1" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="my feature" name="my scenario" time="0.002">\n' +
           '    <system-out><![CDATA[Given a passing step......................................................passed\n' +
           'When a passing step.......................................................passed]]></system-out>\n' +
@@ -408,7 +408,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.002" tests="2">\n' +
+          '<testsuite failures="1" skipped="0" name="cucumber-js" time="0.002" tests="2" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="my feature" name="my templated scenario" time="0.001">\n' +
           '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
           '  </testcase>\n' +
@@ -460,7 +460,7 @@ describe('JunitFormatter', () => {
         // Assert
         expect(output).xml.to.deep.equal(
           '<?xml version="1.0"?>\n' +
-            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="2">\n' +
+            '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="2" timestamp="1970-01-01T00:00:00">\n' +
             '  <testcase classname="my feature" name="my rule: first example" time="0.001">\n' +
             '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
             '  </testcase>\n' +
@@ -511,7 +511,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="2">\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.002" tests="2" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="(unnamed feature)" name="(unnamed rule): (unnamed scenario)" time="0.001">\n' +
           '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
           '  </testcase>\n' +
@@ -553,7 +553,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
           '    <system-out><![CDATA[Given I have <![CDATA[cukes]]]]><![CDATA[> in my belly................................passed]]></system-out>\n' +
           '  </testcase>\n' +
@@ -593,7 +593,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="my test suite" time="0.001" tests="1">\n' +
+          '<testsuite failures="0" skipped="0" name="my test suite" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
           '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
           '  </testcase>\n' +
@@ -628,7 +628,7 @@ describe('JunitFormatter', () => {
       // Assert
       expect(output).xml.to.deep.equal(
         '<?xml version="1.0"?>\n' +
-          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1">\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0.001" tests="1" timestamp="1970-01-01T00:00:00">\n' +
           '  <testcase classname="my feature" name="my scenario" time="0.001">\n' +
           '    <system-out><![CDATA[Given a passing step......................................................passed]]></system-out>\n' +
           '  </testcase>\n' +
@@ -636,4 +636,29 @@ describe('JunitFormatter', () => {
       )
     })
   })
+  describe('testsuite timestamp', () => {
+    it('has start time of the tests', async () => {
+      // Arrange
+
+      // Act
+      const first = await testFormatter({ type: 'junit' })
+
+      // Assert
+      expect(first).xml.to.deep.equal(
+        '<?xml version="1.0"?>\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0" tests="0" timestamp="1970-01-01T00:00:00"/>'
+      )
+
+      // Arrange
+      clock.tick(1000)
+      // Act
+      const second = await testFormatter({ type: 'junit' })
+
+      // Assert
+      expect(second).xml.to.deep.equal(
+        '<?xml version="1.0"?>\n' +
+          '<testsuite failures="0" skipped="0" name="cucumber-js" time="0" tests="0" timestamp="1970-01-01T00:00:01"/>'
+      )
+    })
+  })
 })