java 8 time api test

public class ParseUtcDateTimeStringTest {

     @Test
     public void testUtcStringToDate() {
        // "Z" at the end of the date time string is for UTC
        String utcDateStr = "2017-08-28T02:03:41.080Z";
        System.out.println("====== testUtcStringToDate: " + utcDateStr);

        // Parse the utc datetime string to java.time.Instant - defaults formatter to DateTimeFormatter.ISO_INSTANT.
        Instant instant = Instant.parse(utcDateStr);
        System.out.println("Parsed instant in UTC: " + instant);

        // single quote around 'T'
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");

        // convert to LocalDateTime with default time zone
        ZoneId defaultZone = ZoneOffset.systemDefault();
        System.out.println("defaultZone: " + defaultZone);
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneId.of(defaultZone.getId()));
        System.out.println("Converted localDateTime=" + localDateTime);

        // convert to ZonedDateTime - you cannot format an Instant, have to convert it to a formattable date time
        ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.of(defaultZone.getId()));
        System.out.println("Formatted zonedDateTime=" + formatter.format(zonedDateTime));

        // get ZoneOffset and then ZoneRules
        ZoneOffset zoneOffset = zonedDateTime.getOffset();
        System.out.println("zoneOffset: " + zonedDateTime.getOffset());
        ZoneRules zoneRules = ZoneRules.of(zoneOffset);
        System.out.println("zoneRuels: " + zoneRules);

        // ZoneRules tells if it's daylight savings time...
        if (zoneRules.isDaylightSavings(instant)) {
            System.out.println("Auckland summer has daylight saving time, which is 13 hours ahead of UTC");
            Assert.assertEquals("2017-08-28T15:03:41.080", formatter.format(zonedDateTime));
        } else {
            System.out.println("Auckland has winter time 12 hours ahead of UTC");
            Assert.assertEquals("2017-08-28T14:03:41.080", formatter.format(zonedDateTime));
        }
    }
}