diff --git a/packages/playwright-core/src/server/injected/clock.ts b/packages/playwright-core/src/server/injected/clock.ts
index 1d6b4b7017..afce525be1 100644
--- a/packages/playwright-core/src/server/injected/clock.ts
+++ b/packages/playwright-core/src/server/injected/clock.ts
@@ -53,7 +53,7 @@ type Timer = {
 
 interface Embedder {
   dateNow(): number;
-  performanceNow(): DOMHighResTimeStamp;
+  performanceNow(): EmbedderTicks;
   setTimeout(task: () => void, timeout?: number): () => void;
   setInterval(task: () => void, delay: number): () => void;
 }
@@ -147,6 +147,8 @@ export class ClockController {
   }
 
   private async _runTo(to: Ticks) {
+    to = Math.ceil(to) as Ticks;
+
     if (this._now.ticks > to)
       return;
 
@@ -182,7 +184,7 @@ export class ClockController {
   }
 
   private _innerResume() {
-    const now = this._embedder.performanceNow() as EmbedderTicks;
+    const now = this._embedder.performanceNow();
     this._realTime = { startTicks: now, lastSyncTicks: now };
     this._updateRealTimeTimer();
   }
@@ -209,7 +211,7 @@ export class ClockController {
     this._currentRealTimeTimer = {
       callAt,
       dispose: this._embedder.setTimeout(() => {
-        const now = Math.ceil(this._embedder.performanceNow()) as EmbedderTicks;
+        const now = this._embedder.performanceNow();
         this._currentRealTimeTimer = undefined;
         const sinceLastSync = now - this._realTime!.lastSyncTicks;
         this._realTime!.lastSyncTicks = now;
@@ -662,7 +664,7 @@ export function createClock(globalObject: WindowOrWorkerGlobalScope): { clock: C
   const originals = platformOriginals(globalObject);
   const embedder: Embedder = {
     dateNow: () => originals.raw.Date.now(),
-    performanceNow: () => originals.raw.performance!.now(),
+    performanceNow: () => Math.ceil(originals.raw.performance!.now()) as EmbedderTicks,
     setTimeout: (task: () => void, timeout?: number) => {
       const timerId = originals.bound.setTimeout(task, timeout);
       return () => originals.bound.clearTimeout(timerId);
diff --git a/tests/page/page-clock.spec.ts b/tests/page/page-clock.spec.ts
index c433052a32..6c1ed88996 100644
--- a/tests/page/page-clock.spec.ts
+++ b/tests/page/page-clock.spec.ts
@@ -510,3 +510,25 @@ it.describe('while on pause', () => {
     expect(calls).toEqual([{ params: ['outer'] }, { params: ['inner'] }]);
   });
 });
+
+it.describe('Date.now', () => {
+  it('check Date.now is an integer', async ({ page }) => {
+    await page.clock.install();
+    await page.goto('data:text/html,');
+    await page.waitForTimeout(1000);
+    const dateValue = await page.evaluate('Date.now()');
+    expect(Number.isInteger(dateValue)).toBeTruthy();
+    await page.waitForTimeout(1000);
+    const dateValue2 = await page.evaluate('Date.now()');
+    expect(Number.isInteger(dateValue2)).toBeTruthy();
+  });
+
+  it('check Date.now is an integer (2)', async ({ page }) => {
+    await page.clock.install({ time: 0 });
+    await page.goto('data:text/html,');
+    await page.clock.pauseAt(1000);
+    await page.clock.runFor(0.5);
+    const dateValue = await page.evaluate('Date.now()');
+    expect(dateValue).toBe(1001);
+  });
+});