fix: inconsistent timezones in e2e tests

apps/web/playwright/fixtures/bookings.ts

@@ -3,13 +3,16 @@ import type { Booking, Prisma } from "@prisma/client";
 import short from "short-uuid";
 import { v5 as uuidv5 } from "uuid";
 
-import dayjs from "@calcom/dayjs";
+import _dayjs from "@calcom/dayjs";
 import { prisma } from "@calcom/prisma";
 
 const translator = short();
 
 type BookingFixture = ReturnType<typeof createBookingFixture>;
 
+// We default all dayjs calls to use Europe/London timezone
+const dayjs = (...args: Parameters<typeof _dayjs>) => _dayjs(...args).tz("Europe/London");
+
 // creates a user fixture instance and stores the collection
 export const createBookingsFixture = (page: Page) => {
   const store = { bookings: [], page } as { bookings: BookingFixture[]; page: typeof page };

apps/web/playwright/fixtures/users.ts

@@ -4,15 +4,14 @@ import { Prisma as PrismaType } from "@prisma/client";
 import { hashSync as hash } from "bcryptjs";
 import type { API } from "mailhog";
 
-import dayjs from "@calcom/dayjs";
 import stripe from "@calcom/features/ee/payments/server/stripe";
 import { DEFAULT_SCHEDULE, getAvailabilityFromSchedule } from "@calcom/lib/availability";
 import { WEBAPP_URL } from "@calcom/lib/constants";
 import { prisma } from "@calcom/prisma";
 import { MembershipRole, SchedulingType } from "@calcom/prisma/enums";
 
 import { selectFirstAvailableTimeSlotNextMonth, teamEventSlug, teamEventTitle } from "../lib/testUtils";
-import type { TimeZoneEnum } from "./types";
+import { TimeZoneEnum } from "./types";
 
 // Don't import hashPassword from app as that ends up importing next-auth and initializing it before NEXTAUTH_URL can be updated during tests.
 export function hashPassword(password: string) {
@@ -477,13 +476,14 @@ const createUser = (workerInfo: WorkerInfo, opts?: CustomUserOpts | null): Prism
     password: hashPassword(uname),
     emailVerified: new Date(),
     completedOnboarding: opts?.completedOnboarding ?? true,
-    timeZone: opts?.timeZone ?? dayjs.tz.guess(),
+    timeZone: opts?.timeZone ?? TimeZoneEnum.UK,
     locale: opts?.locale ?? "en",
     schedules:
       opts?.completedOnboarding ?? true
         ? {
             create: {
               name: "Working Hours",
+              timeZone: opts?.timeZone ?? TimeZoneEnum.UK,
               availability: {
                 createMany: {
                   data: getAvailabilityFromSchedule(DEFAULT_SCHEDULE),

apps/web/playwright/wipe-my-cal.e2e.ts

@@ -1,6 +1,6 @@
 import { expect } from "@playwright/test";
 
-import dayjs from "@calcom/dayjs";
+import _dayjs from "@calcom/dayjs";
 import prisma from "@calcom/prisma";
 
 import { test } from "./lib/fixtures";
@@ -9,6 +9,9 @@ test.describe.configure({ mode: "parallel" });
 
 test.afterEach(({ users }) => users.deleteAll());
 
+// We default all dayjs calls to use Europe/London timezone
+const dayjs = (...args: Parameters<typeof _dayjs>) => _dayjs(...args).tz("Europe/London");
+
 test.describe("Wipe my Cal App Test", () => {
   test("Browse upcoming bookings and validate button shows and triggering wipe my cal button", async ({
     page,

playwright.config.ts

@@ -55,6 +55,14 @@ if (IS_EMBED_REACT_TEST) {
   });
 }
 
+const DEFAULT_CHROMIUM = {
+  ...devices["Desktop Chrome"],
+  timezoneId: "Europe/London",
+  locale: "en-US",
+  /** If navigation takes more than this, then something's wrong, let's fail fast. */
+  navigationTimeout: DEFAULT_NAVIGATION_TIMEOUT,
+};
+
 const config: PlaywrightTestConfig = {
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
@@ -86,12 +94,7 @@ const config: PlaywrightTestConfig = {
       expect: {
         timeout: DEFAULT_EXPECT_TIMEOUT,
       },
-      use: {
-        ...devices["Desktop Chrome"],
-        locale: "en-US",
-        /** If navigation takes more than this, then something's wrong, let's fail fast. */
-        navigationTimeout: DEFAULT_NAVIGATION_TIMEOUT,
-      },
+      use: DEFAULT_CHROMIUM,
     },
     {
       name: "@calcom/app-store",
@@ -100,12 +103,7 @@ const config: PlaywrightTestConfig = {
       expect: {
         timeout: DEFAULT_EXPECT_TIMEOUT,
       },
-      use: {
-        ...devices["Desktop Chrome"],
-        locale: "en-US",
-        /** If navigation takes more than this, then something's wrong, let's fail fast. */
-        navigationTimeout: DEFAULT_NAVIGATION_TIMEOUT,
-      },
+      use: DEFAULT_CHROMIUM,
     },
     {
       name: "@calcom/embed-core",
@@ -114,7 +112,11 @@ const config: PlaywrightTestConfig = {
       expect: {
         timeout: DEFAULT_EXPECT_TIMEOUT,
       },
-      use: { ...devices["Desktop Chrome"], locale: "en-US", baseURL: "http://localhost:3100/" },
+      use: {
+        ...devices["Desktop Chrome"],
+        locale: "en-US",
+        baseURL: "http://localhost:3100/",
+      },
     },
     {
       name: "@calcom/embed-react",
@@ -123,7 +125,10 @@ const config: PlaywrightTestConfig = {
         timeout: DEFAULT_EXPECT_TIMEOUT,
       },
       testMatch: /.*\.e2e\.tsx?/,
-      use: { ...devices["Desktop Chrome"], locale: "en-US", baseURL: "http://localhost:3101/" },
+      use: {
+        ...DEFAULT_CHROMIUM,
+        baseURL: "http://localhost:3101/",
+      },
     },
     {
       name: "@calcom/embed-core--firefox",