v8/test/intl/date-format/timezone.js

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// Tests time zone support.

// TODO(littledan): getDefaultTimeZone() is not available from JavaScript
// var df = Intl.DateTimeFormat();
// assertEquals(getDefaultTimeZone(), df.resolvedOptions().timeZone);

[
  'UtC', 'gmt', 'Etc/UTC', 'Etc/GMT', 'Etc/GMT0', 'Etc/GMT+0',
  'etc/gmt-0', 'etc/zulu', 'Etc/universal', 'etc/greenwich'
].forEach((timezone) => {
  const df = Intl.DateTimeFormat(undefined, {timeZone: timezone});
  assertEquals('UTC', df.resolvedOptions().timeZone);
})

// See test/mjsunit/regress/regress-crbug-364374.js for additional/ tests.

df = Intl.DateTimeFormat(undefined, {timeZone: 'America/Los_Angeles'});
assertEquals('America/Los_Angeles', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'Europe/Belgrade'});
assertEquals('Europe/Belgrade', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'euRope/beLGRade'});
assertEquals('Europe/Belgrade', df.resolvedOptions().timeZone);

// Etc/GMT-14 to Etc/GMT+12 are valid.
df = Intl.DateTimeFormat(undefined, {timeZone: 'etc/gmt+12'});
assertEquals('Etc/GMT+12', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'etc/gmt+9'});
assertEquals('Etc/GMT+9', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'etc/gmt-9'});
assertEquals('Etc/GMT-9', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'etc/gmt-14'});
assertEquals('Etc/GMT-14', df.resolvedOptions().timeZone);

assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'Etc/GMT+13\'})');

// : + - are not allowed, only / _ are.
assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT+07:00\'})');
assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT+0700\'})');
assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT-05:00\'})');
assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'GMT-0500\'})');
assertThrows('Intl.DateTimeFormat(undefined, ' +
    '{timeZone: \'America/Los-Angeles\'})');

// Throws for unsupported time zones.
assertThrows('Intl.DateTimeFormat(undefined, {timeZone: \'Aurope/Belgrade\'})');