diff --git a/browsers.json b/browsers.json
index df9b52ca6b..7a748a472e 100644
--- a/browsers.json
+++ b/browsers.json
@@ -18,7 +18,7 @@
     },
     {
       "name": "webkit",
-      "revision": "1486",
+      "revision": "1488",
       "installByDefault": true,
       "revisionOverrides": {
         "mac10.14": "1444"
diff --git a/tests/browsercontext-locale.spec.ts b/tests/browsercontext-locale.spec.ts
index db13548dc0..b4b1a223ef 100644
--- a/tests/browsercontext-locale.spec.ts
+++ b/tests/browsercontext-locale.spec.ts
@@ -52,12 +52,14 @@ it('should format number', async ({browser, server}) => {
   }
 });
 
-it('should format date', async ({browser, server}) => {
+it('should format date', async ({browser, server, browserName}) => {
   {
     const context = await browser.newContext({ locale: 'en-US', timezoneId: 'America/Los_Angeles' });
     const page = await context.newPage();
     await page.goto(server.EMPTY_PAGE);
-    const formatted = 'Sat Nov 19 2016 10:12:34 GMT-0800 (Pacific Standard Time)';
+    const formatted = browserName === 'webkit' ?
+      'Sat Nov 19 2016 10:12:34 GMT-0800' :
+      'Sat Nov 19 2016 10:12:34 GMT-0800 (Pacific Standard Time)';
     expect(await page.evaluate(() => new Date(1479579154987).toString())).toBe(formatted);
     await context.close();
   }
@@ -65,8 +67,10 @@ it('should format date', async ({browser, server}) => {
     const context = await browser.newContext({ locale: 'de-DE', timezoneId: 'Europe/Berlin' });
     const page = await context.newPage();
     await page.goto(server.EMPTY_PAGE);
-    expect(await page.evaluate(() => new Date(1479579154987).toString())).toBe(
-        'Sat Nov 19 2016 19:12:34 GMT+0100 (Mitteleuropäische Normalzeit)');
+    const formatted = browserName === 'webkit' ?
+      'Sat Nov 19 2016 19:12:34 GMT+0100' :
+      'Sat Nov 19 2016 19:12:34 GMT+0100 (Mitteleuropäische Normalzeit)';
+    expect(await page.evaluate(() => new Date(1479579154987).toString())).toBe(formatted);
     await context.close();
   }
 });
diff --git a/tests/browsercontext-timezone-id.spec.ts b/tests/browsercontext-timezone-id.spec.ts
index 9ed8953f9f..e279b8f138 100644
--- a/tests/browsercontext-timezone-id.spec.ts
+++ b/tests/browsercontext-timezone-id.spec.ts
@@ -17,30 +17,38 @@
 
 import { browserTest as it, expect } from './config/browserTest';
 
-it('should work', async ({ browser }) => {
+it('should work', async ({ browser, browserName }) => {
   const func = () => new Date(1479579154987).toString();
   {
     const context = await browser.newContext({ locale: 'en-US', timezoneId: 'America/Jamaica' });
     const page = await context.newPage();
-    expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
+    expect(await page.evaluate(func)).toBe(browserName === 'webkit' ?
+      'Sat Nov 19 2016 13:12:34 GMT-0500' :
+      'Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
     await context.close();
   }
   {
     const context = await browser.newContext({ locale: 'en-US', timezoneId: 'Pacific/Honolulu' });
     const page = await context.newPage();
-    expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 08:12:34 GMT-1000 (Hawaii-Aleutian Standard Time)');
+    expect(await page.evaluate(func)).toBe(browserName === 'webkit' ?
+      'Sat Nov 19 2016 08:12:34 GMT-1000' :
+      'Sat Nov 19 2016 08:12:34 GMT-1000 (Hawaii-Aleutian Standard Time)');
     await context.close();
   }
   {
     const context = await browser.newContext({ locale: 'en-US', timezoneId: 'America/Buenos_Aires' });
     const page = await context.newPage();
-    expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 15:12:34 GMT-0300 (Argentina Standard Time)');
+    expect(await page.evaluate(func)).toBe(browserName === 'webkit' ?
+      'Sat Nov 19 2016 15:12:34 GMT-0300' :
+      'Sat Nov 19 2016 15:12:34 GMT-0300 (Argentina Standard Time)');
     await context.close();
   }
   {
     const context = await browser.newContext({ locale: 'en-US', timezoneId: 'Europe/Berlin' });
     const page = await context.newPage();
-    expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 19:12:34 GMT+0100 (Central European Standard Time)');
+    expect(await page.evaluate(func)).toBe(browserName === 'webkit' ?
+      'Sat Nov 19 2016 19:12:34 GMT+0100' :
+      'Sat Nov 19 2016 19:12:34 GMT+0100 (Central European Standard Time)');
     await context.close();
   }
 });
diff --git a/tests/defaultbrowsercontext-2.spec.ts b/tests/defaultbrowsercontext-2.spec.ts
index 4c32746a69..8f63dfe1c5 100644
--- a/tests/defaultbrowsercontext-2.spec.ts
+++ b/tests/defaultbrowsercontext-2.spec.ts
@@ -44,9 +44,11 @@ it('should support reducedMotion option', async ({launchPersistent}) => {
   expect(await page.evaluate(() => matchMedia('(prefers-reduced-motion: no-preference)').matches)).toBe(false);
 });
 
-it('should support timezoneId option', async ({launchPersistent}) => {
+it('should support timezoneId option', async ({launchPersistent, browserName}) => {
   const {page} = await launchPersistent({locale: 'en-US', timezoneId: 'America/Jamaica'});
-  expect(await page.evaluate(() => new Date(1479579154987).toString())).toBe('Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
+  expect(await page.evaluate(() => new Date(1479579154987).toString())).toBe(browserName === 'webkit' ?
+    'Sat Nov 19 2016 13:12:34 GMT-0500' :
+    'Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
 });
 
 it('should support locale option', async ({launchPersistent}) => {