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

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// Tests time zone names.

// Winter date (PST).
var winter = new Date(2013, 1, 12, 14, 42, 53, 0);

// Summer date (PDT).
var summer = new Date(2013, 7, 12, 14, 42, 53, 0);

// Common flags for both formatters.
var flags = {
  year: 'numeric', month: 'long', day: 'numeric',
  hour : '2-digit', minute : '2-digit', second : '2-digit',
  timeZone: 'America/Los_Angeles'
};

flags.timeZoneName = "short";
var dfs = new Intl.DateTimeFormat('en-US', flags);

assertTrue(dfs.format(winter).indexOf('PST') !== -1);
assertTrue(dfs.format(summer).indexOf('PDT') !== -1);

flags.timeZoneName = "long";
var dfl = new Intl.DateTimeFormat('en-US', flags);

assertTrue(dfl.format(winter).indexOf('Pacific Standard Time') !== -1);
assertTrue(dfl.format(summer).indexOf('Pacific Daylight Time') !== -1);