datetime-utc and "Z" token #21
Description
Version 2.2.1 can't pass the test (https://github.com/eight04/angular-datetime/blob/master/test/test.js#L170).
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Version 2.2.1 can't pass the test (https://github.com/eight04/angular-datetime/blob/master/test/test.js#L170).