The time difference between Seattle and Sydney is 18 hours. When it is 12:00 noon in Seattle, it is 06:00 in Sydney. Seattle uses the America/Los_Angeles time zone (UTC-7), while Sydney uses Australia/Sydney (UTC+11).
With a 18 hours gap, there is no standard business-hours overlap between Seattle and Sydney. One party will need to adjust their schedule. Early mornings in Sydney or late evenings in Seattle tend to be the most practical compromise.
Use this table to quickly convert any hour from Seattle time to Sydney time. Rows highlighted in green indicate overlapping business hours in both cities.
| Seattle | Sydney | |
|---|---|---|
| 00:00 | 18:00 | Night |
| 01:00 | 19:00 | Night |
| 02:00 | 20:00 | Night |
| 03:00 | 21:00 | Night |
| 04:00 | 22:00 | Night |
| 05:00 | 23:00 | Night |
| 06:00 | 00:00 (+1 day) | |
| 07:00 | 01:00 (+1 day) | |
| 08:00 | 02:00 (+1 day) | |
| 09:00 | 03:00 (+1 day) | |
| 10:00 | 04:00 (+1 day) | |
| 11:00 | 05:00 (+1 day) | |
| 12:00 | 06:00 (+1 day) | |
| 13:00 | 07:00 (+1 day) | |
| 14:00 | 08:00 (+1 day) | |
| 15:00 | 09:00 (+1 day) | Overlap |
| 16:00 | 10:00 (+1 day) | Overlap |
| 17:00 | 11:00 (+1 day) | |
| 18:00 | 12:00 (+1 day) | |
| 19:00 | 13:00 (+1 day) | |
| 20:00 | 14:00 (+1 day) | |
| 21:00 | 15:00 (+1 day) | |
| 22:00 | 16:00 (+1 day) | Night |
| 23:00 | 17:00 (+1 day) | Night |
Both Seattle and Sydney are currently observing daylight saving time. The current 18 hours difference reflects both cities' DST offsets. When one city switches back to standard time before the other, the gap will temporarily change by 1 hour.
The time difference is 18 hours. Sydney is 18 hours ahead of Seattle.
Yes. Both cities observe daylight saving time, but they may switch on different dates, causing the gap to shift by 1 hour temporarily.
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Add 18 hours to Seattle time to get Sydney time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.