Melbourne, Australia is the east 10 zone, and Seattle, USA is the west 8 zone, so Melbourne is 18 hours faster than Seattle, but both cities have daylight saving time. At present, Seattle in the United States implements daylight saving time, which is 1 hour faster than Seattle, so Melbourne is 17 hour faster than Seattle. After the end of Seattle daylight saving time, Melbourne daylight saving time has not yet started. Due to the span of daylight saving time, Melbourne and Seattle are not in daylight saving time for only a few weeks, and the time difference is 18 hours, mostly 17 hours or 19 hours.