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);

df = Intl.DateTimeFormat(undefined, {timeZone: 'UtC'});
assertEquals('UTC', df.resolvedOptions().timeZone);

df = Intl.DateTimeFormat(undefined, {timeZone: 'gmt'});
assertEquals('UTC', df.resolvedOptions().timeZone);

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);

// Check Etc/XXX variants. They should work too.
df = Intl.DateTimeFormat(undefined, {timeZone: 'Etc/UTC'});
assertEquals('UTC', df.resolvedOptions().timeZone);

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

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

// : + - 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: \'Etc/GMT+0\'})');
assertThrows('Intl.DateTimeFormat(undefined, ' +
    '{timeZone: \'America/Los-Angeles\'})');

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