diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 9bc1ed1baab0..1dd95f37f38a 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -2,4 +2,4 @@ Before submitting a pull request, please take a look at our
 [Contributing](https://github.com/getsentry/sentry-javascript/blob/master/CONTRIBUTING.md) guidelines and verify:
 
 - [ ] If you've added code that should be tested, please add tests.
-- [ ] Ensure your code lints and the test suite passes (`yarn lint`) & (`yarn test`).
+- [ ] Ensure your code lints and the test suite passes (`yarn build && yarn lint && yarn test`).
diff --git a/packages/replay-internal/src/coreHandlers/handleClick.ts b/packages/replay-internal/src/coreHandlers/handleClick.ts
index dab5d04657fc..43cbe2e2bc52 100644
--- a/packages/replay-internal/src/coreHandlers/handleClick.ts
+++ b/packages/replay-internal/src/coreHandlers/handleClick.ts
@@ -16,9 +16,7 @@ import { addBreadcrumbEvent } from './util/addBreadcrumbEvent';
 import { getClosestInteractive } from './util/domUtils';
 import { onWindowOpen } from './util/onWindowOpen';
 
-type ClickBreadcrumb = Breadcrumb & {
-  timestamp: number;
-};
+type ClickBreadcrumb = Breadcrumb;
 
 interface Click {
   timestamp: number;
@@ -114,8 +112,12 @@ export class ClickDetector implements ReplayClickDetector {
       return;
     }
 
+    const timestampAsNumber = typeof breadcrumb.timestamp === 'string'
+      ? new Date(breadcrumb.timestamp).getTime()
+      : breadcrumb.timestamp || 0;
+
     const newClick: Click = {
-      timestamp: timestampToS(breadcrumb.timestamp),
+      timestamp: timestampToS(timestampAsNumber),
       clickBreadcrumb: breadcrumb,
       // Set this to 0 so we know it originates from the click breadcrumb
       clickCount: 0,
@@ -209,6 +211,9 @@ export class ClickDetector implements ReplayClickDetector {
 
     const isSlowClick = !hadScroll && !hadMutation;
     const { clickCount, clickBreadcrumb } = click;
+    const timestampAsNumber = typeof clickBreadcrumb.timestamp === 'string'
+      ? new Date(clickBreadcrumb.timestamp).getTime()
+      : clickBreadcrumb.timestamp || 0;
 
     // Slow click
     if (isSlowClick) {
@@ -220,7 +225,7 @@ export class ClickDetector implements ReplayClickDetector {
       const breadcrumb: ReplaySlowClickFrame = {
         type: 'default',
         message: clickBreadcrumb.message,
-        timestamp: clickBreadcrumb.timestamp,
+        timestamp: timestampAsNumber,
         category: 'ui.slowClickDetected',
         data: {
           ...clickBreadcrumb.data,
@@ -243,7 +248,7 @@ export class ClickDetector implements ReplayClickDetector {
       const breadcrumb: ReplayMultiClickFrame = {
         type: 'default',
         message: clickBreadcrumb.message,
-        timestamp: clickBreadcrumb.timestamp,
+        timestamp: timestampAsNumber,
         category: 'ui.multiClick',
         data: {
           ...clickBreadcrumb.data,
diff --git a/packages/replay-internal/src/coreHandlers/util/addBreadcrumbEvent.ts b/packages/replay-internal/src/coreHandlers/util/addBreadcrumbEvent.ts
index a324e5b24b25..7b1f995106ab 100644
--- a/packages/replay-internal/src/coreHandlers/util/addBreadcrumbEvent.ts
+++ b/packages/replay-internal/src/coreHandlers/util/addBreadcrumbEvent.ts
@@ -19,13 +19,17 @@ export function addBreadcrumbEvent(replay: ReplayContainer, breadcrumb: Breadcru
   }
 
   replay.addUpdate(() => {
+    const timestampAsNumber = typeof breadcrumb.timestamp === 'string'
+      ? new Date(breadcrumb.timestamp).getTime() / 1000
+      : breadcrumb.timestamp || 0;
+
     // This should never reject
     // eslint-disable-next-line @typescript-eslint/no-floating-promises
     replay.throttledAddEvent({
       type: EventType.Custom,
       // TODO: We were converting from ms to seconds for breadcrumbs, spans,
       // but maybe we should just keep them as milliseconds
-      timestamp: (breadcrumb.timestamp || 0) * 1000,
+      timestamp: timestampAsNumber * 1000,
       data: {
         tag: 'breadcrumb',
         // normalize to max. 10 depth and 1_000 properties per object
diff --git a/packages/replay-internal/src/replay.ts b/packages/replay-internal/src/replay.ts
index 6588a9e4d79d..4838eac9e749 100644
--- a/packages/replay-internal/src/replay.ts
+++ b/packages/replay-internal/src/replay.ts
@@ -700,10 +700,13 @@ export class ReplayContainer implements ReplayContainerInterface {
       });
 
       this.addUpdate(() => {
+        const timestampAsNumber = typeof breadcrumb.timestamp === 'string'
+          ? new Date(breadcrumb.timestamp).getTime()
+          : breadcrumb.timestamp || 0;
         // Return `false` if the event _was_ added, as that means we schedule a flush
         return !addEventSync(this, {
           type: ReplayEventTypeCustom,
-          timestamp: breadcrumb.timestamp || 0,
+          timestamp: timestampAsNumber,
           data: {
             tag: 'breadcrumb',
             payload: breadcrumb,
@@ -1003,11 +1006,14 @@ export class ReplayContainer implements ReplayContainerInterface {
    */
   private _createCustomBreadcrumb(breadcrumb: ReplayBreadcrumbFrame): void {
     this.addUpdate(() => {
+      const timestampAsNumber = typeof breadcrumb.timestamp === 'string'
+          ? new Date(breadcrumb.timestamp).getTime()
+          : breadcrumb.timestamp || 0;
       // This should never reject
       // eslint-disable-next-line @typescript-eslint/no-floating-promises
       this.throttledAddEvent({
         type: EventType.Custom,
-        timestamp: breadcrumb.timestamp || 0,
+        timestamp: timestampAsNumber,
         data: {
           tag: 'breadcrumb',
           payload: breadcrumb,
diff --git a/packages/replay-internal/src/types/replayFrame.ts b/packages/replay-internal/src/types/replayFrame.ts
index 48dc4aa72a2a..c87160cc0a6e 100644
--- a/packages/replay-internal/src/types/replayFrame.ts
+++ b/packages/replay-internal/src/types/replayFrame.ts
@@ -14,7 +14,7 @@ import type { ReplayEventTypeCustom } from './rrweb';
 type AnyRecord = Record<string, any>; // eslint-disable-line @typescript-eslint/no-explicit-any
 
 interface ReplayBaseBreadcrumbFrame {
-  timestamp: number;
+  timestamp: number | string;
   /**
    * For compatibility reasons
    */
diff --git a/packages/replay-internal/test/unit/coreHandlers/util/addBreadcrumbEvent.test.ts b/packages/replay-internal/test/unit/coreHandlers/util/addBreadcrumbEvent.test.ts
index 45483ebab5b4..0487f63210d7 100644
--- a/packages/replay-internal/test/unit/coreHandlers/util/addBreadcrumbEvent.test.ts
+++ b/packages/replay-internal/test/unit/coreHandlers/util/addBreadcrumbEvent.test.ts
@@ -47,4 +47,31 @@ describe('Unit | coreHandlers | util | addBreadcrumbEvent', function () {
       },
     ]);
   });
+
+  it('handles timestamp as string', async () => {
+    const baseTimestampAsISOString = new Date(BASE_TIMESTAMP).toISOString()
+    const breadcrumb: any = {
+      category: 'console',
+      message: 'Test message with timestamp as string',
+      timestamp: baseTimestampAsISOString,
+    };
+
+    const replay = setupReplayContainer();
+    addBreadcrumbEvent(replay, breadcrumb);
+
+    expect((replay.eventBuffer as EventBufferArray).events).toEqual([
+      {
+        type: 5,
+        timestamp: BASE_TIMESTAMP,
+        data: {
+          tag: 'breadcrumb',
+          payload: {
+            category: 'console',
+            message: 'Test message with timestamp as string',
+            timestamp: baseTimestampAsISOString,
+          },
+        },
+      },
+    ]);
+  });
 });