timezone.js - mozsearch

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// |jit-test| tz-pacific; skip-if: typeof Intl === 'undefined'

let tzRE = /\(([^\)]+)\)/;

const SPOOFED_TZ_NAME = "Atlantic/Reykjavik";

const SPOOFED_TZ_GENERIC = "Greenwich Mean Time";

// Make sure we aren't already running with spoofed TZ

let original = new Date(0);

assertEq(tzRE.exec(original.toString())[1], "Pacific Standard Time");

let originalDT = Intl.DateTimeFormat("en-US", {

  dateStyle: "full",

  timeStyle: "full",

});

assertEq(originalDT.format(original).endsWith("Pacific Standard Time"), true);

assertEq(originalDT.resolvedOptions().timeZone, "America/Los_Angeles");

let global = newGlobal({forceUTC: true});

let date = new global.Date();

assertEq(tzRE.exec(date.toString())[1], SPOOFED_TZ_GENERIC);

assertEq(tzRE.exec(date.toTimeString())[1], SPOOFED_TZ_GENERIC);

assertEq(date.getFullYear(), date.getUTCFullYear());

assertEq(date.getMonth(), date.getUTCMonth());

assertEq(date.getDate(), date.getUTCDate());

assertEq(date.getDay(), date.getUTCDay());

assertEq(date.getHours(),date.getUTCHours());

assertEq(date.getTimezoneOffset(), 0);

let dt = global.Intl.DateTimeFormat("en-US", {

  dateStyle: "full",

  timeStyle: "full",

});

assertEq(dt.format(date).endsWith(SPOOFED_TZ_GENERIC), true);

assertEq(dt.resolvedOptions().timeZone, SPOOFED_TZ_NAME);