fix: tests failed due to timezone issues

.env.test

@@ -44,3 +44,5 @@ GOOGLE_DYNAMIC_MAP_ID="test"
 HIDE_FOR_NEXT_RELEASE="true"
 SALESFORCE_PREFERENCE_BASE_URL="test"
 USE_NEW_REWARDS_ENDPOINT="true"
+
+TZ=UTC

app/[lang]/(live)/(public)/hotelreservation/(standard)/select-rate/getValidDates.test.ts

@@ -3,11 +3,22 @@ import { beforeAll, describe, expect, it } from "@jest/globals"
 import { getValidFromDate, getValidToDate } from "./getValidDates"
 
 const NOW = new Date("2020-10-01T00:00:00Z")
+let originalTz: string | undefined
+
 describe("getValidFromDate", () => {
   beforeAll(() => {
     jest.useFakeTimers({ now: NOW })
+    originalTz = process.env.TZ
+    console.log("originalTz", originalTz)
+    process.env.TZ = "UTC"
   })
 
+  afterAll(() => {
+    process.env.TZ = originalTz
+    jest.useRealTimers()
+  })
+
+  describe("getValidFromDate", () => {
     it("returns today when empty string is provided", () => {
       const actual = getValidFromDate("")
       expect(actual.toISOString()).toBe("2020-10-01T00:00:00.000Z")
@@ -20,15 +31,11 @@ describe("getValidFromDate", () => {
 
     it("returns given date in utc", () => {
       const actual = getValidFromDate("2024-01-01")
-    expect(actual.toISOString()).toBe("2023-12-31T23:00:00.000Z")
+      expect(actual.toISOString()).toBe("2024-01-01T00:00:00.000Z")
     })
   })
 
   describe("getValidToDate", () => {
-  beforeAll(() => {
-    jest.useFakeTimers({ now: NOW })
-  })
-
     it("returns day after fromDate when empty string is provided", () => {
       const actual = getValidToDate("", NOW)
       expect(actual.toISOString()).toBe("2020-10-02T00:00:00.000Z")
@@ -41,7 +48,7 @@ describe("getValidToDate", () => {
 
     it("returns given date in utc", () => {
       const actual = getValidToDate("2024-01-01", NOW)
-    expect(actual.toISOString()).toBe("2023-12-31T23:00:00.000Z")
+      expect(actual.toISOString()).toBe("2024-01-01T00:00:00.000Z")
     })
 
     it("fallsback to day after fromDate when given date is before fromDate", () => {
@@ -49,3 +56,4 @@ describe("getValidToDate", () => {
       expect(actual.toISOString()).toBe("2020-10-02T00:00:00.000Z")
     })
   })
+})