diff --git a/CHANGELOG.md b/CHANGELOG.md
index dfb02abcd021..01e5bb097cc7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - `[jest-circus]` Add a `waitBeforeRetry` option to `jest.retryTimes` ([#14738](https://github.com/jestjs/jest/pull/14738))
 - `[jest-circus]` Add a `retryImmediately` option to `jest.retryTimes` ([#14696](https://github.com/jestjs/jest/pull/14696))
 - `[jest-circus, jest-jasmine2]` Allow `setupFilesAfterEnv` to export an async function ([#10962](https://github.com/jestjs/jest/issues/10962))
+- `[jest-circus, jest-test-result]` Add `startedAt` timestamp in `TestCaseResultObject` within `onTestCaseResult` ([#15145](https://github.com/jestjs/jest/pull/15145))
 - `[jest-config]` [**BREAKING**] Add `mts` and `cts` to default `moduleFileExtensions` config ([#14369](https://github.com/facebook/jest/pull/14369))
 - `[jest-config]` [**BREAKING**] Update `testMatch` and `testRegex` default option for supporting `mjs`, `cjs`, `mts`, and `cts` ([#14584](https://github.com/jestjs/jest/pull/14584))
 - `[jest-config]` Loads config file from provided path in `package.json` ([#14044](https://github.com/facebook/jest/pull/14044))
diff --git a/e2e/__tests__/__snapshots__/customReportersOnCircus.test.ts.snap b/e2e/__tests__/__snapshots__/customReportersOnCircus.test.ts.snap
index e52b96c3dbb6..6403c2c464f4 100644
--- a/e2e/__tests__/__snapshots__/customReportersOnCircus.test.ts.snap
+++ b/e2e/__tests__/__snapshots__/customReportersOnCircus.test.ts.snap
@@ -1,17 +1,17 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`Custom Reporters Integration on jest-circus valid failing assertion counts for adding reporters 1`] = `
-"onTestCaseResult: adds fail, status: failed, numExpectations: 0
+"onTestCaseResult: adds fail, started: today, status: failed, numExpectations: 0
 onTestFileResult testCaseResult 0: adds fail, status: failed, numExpectations: 0"
 `;
 
 exports[`Custom Reporters Integration on jest-circus valid passing assertion counts for adding reporters 1`] = `
-"onTestCaseResult: adds ok, status: passed, numExpectations: 3
+"onTestCaseResult: adds ok, started: today, status: passed, numExpectations: 3
 onTestFileResult testCaseResult 0: adds ok, status: passed, numExpectations: 3"
 `;
 
 exports[`Custom Reporters Integration on jest-circus push test case results for todo tests 1`] = `
-"onTestCaseResult: sample, status: todo, numExpectations: 0
+"onTestCaseResult: sample, started: today, status: todo, numExpectations: 0
 onTestFileResult testCaseResult 0: sample, status: todo, numExpectations: 0"
 `;
 
diff --git a/e2e/custom-reporters/reporters/AssertionCountsReporter.js b/e2e/custom-reporters/reporters/AssertionCountsReporter.js
index 7777efd828b0..8b177283c2d6 100644
--- a/e2e/custom-reporters/reporters/AssertionCountsReporter.js
+++ b/e2e/custom-reporters/reporters/AssertionCountsReporter.js
@@ -18,8 +18,12 @@ class AssertionCountsReporter {
     }
   }
   onTestCaseResult(test, testCaseResult) {
+    const difference = new Date(
+      Date.now() - testCaseResult.startedAt,
+    ).getDate();
     console.log(
       `onTestCaseResult: ${testCaseResult.title}, ` +
+        `started: ${difference === 1 ? 'today' : 'invalid'}, ` +
         `status: ${testCaseResult.status}, ` +
         `numExpectations: ${testCaseResult.numPassingAsserts}`,
     );
diff --git a/packages/jest-circus/src/utils.ts b/packages/jest-circus/src/utils.ts
index 84aab232bde1..9776072964b0 100644
--- a/packages/jest-circus/src/utils.ts
+++ b/packages/jest-circus/src/utils.ts
@@ -11,7 +11,7 @@ import dedent from 'dedent';
 import isGeneratorFn from 'is-generator-fn';
 import slash = require('slash');
 import StackUtils = require('stack-utils');
-import type {AssertionResult, Status} from '@jest/test-result';
+import type {Status, TestCaseResult} from '@jest/test-result';
 import type {Circus, Global} from '@jest/types';
 import {
   ErrorWithStack,
@@ -490,7 +490,7 @@ const resolveTestCaseStartInfo = (
 
 export const parseSingleTestResult = (
   testResult: Circus.TestResult,
-): AssertionResult => {
+): TestCaseResult => {
   let status: Status;
   if (testResult.status === 'skip') {
     status = 'pending';
@@ -517,6 +517,7 @@ export const parseSingleTestResult = (
     location: testResult.location,
     numPassingAsserts: testResult.numPassingAsserts,
     retryReasons: [...testResult.retryReasons],
+    startedAt: testResult.startedAt,
     status,
     title,
   };
diff --git a/packages/jest-test-result/src/types.ts b/packages/jest-test-result/src/types.ts
index 7200d5a73da8..6fb6c645e2c9 100644
--- a/packages/jest-test-result/src/types.ts
+++ b/packages/jest-test-result/src/types.ts
@@ -85,7 +85,7 @@ export type Suite = {
   tests: Array<AssertionResult>;
 };
 
-export type TestCaseResult = AssertionResult;
+export type TestCaseResult = AssertionResult & {startedAt?: number | null};
 
 export type TestResult = {
   console?: ConsoleBuffer;
@@ -209,7 +209,7 @@ export type TestEvents = {
   'test-file-success': [Test, TestResult];
   'test-file-failure': [Test, SerializableError];
   'test-case-start': [string, Circus.TestCaseStartInfo];
-  'test-case-result': [string, AssertionResult];
+  'test-case-result': [string, TestCaseResult];
 };
 
 export type TestFileEvent<T extends keyof TestEvents = keyof TestEvents> = (