convert long to localdatetime java

1    public long createTimestamp() {
2        ZoneId zoneId = ZoneId.systemDefault();
3        return LocalDateTime.now().atZone(zoneId).toEpochSecond();
4    }

1long test_timestamp = 1499070300L;
2LocalDateTime triggerTime =
3       LocalDateTime.ofInstant(Instant.ofEpochSecond(test_timestamp),
4                               TimeZone.getDefault().toZoneId());   
5
6System.out.println(triggerTime);
7