getYear() is based from 1900, if you use getFullYear() you'll get 2017. Though, given all the additions to ES201*, it would be nice if all the timezone data were in the browsers, so one could get moment-timezone without the, relatively large data files.
.getYear() and .setYear() are deprecated in all recent standards [IIRC they were before 2000, I certainly remember them being recommended against as far back as that].
