public static TimestampFormatter of(final String pattern, final String zoneIdString) {
        return new TimestampFormatter(pattern, zoneIdString);
    }
@Test
    public void testRuby() {
        testRubyToFormat(OffsetDateTime.of(2017, 2, 28, 2, 0, 45, 0, ZoneOffset.UTC).toInstant(),
                         "%Y-%m-%dT%H:%M:%S %Z",
                         "-09:00",
                         "2017-02-27T17:00:45 -09:00");
    }