The time difference between Sydney and Seattle is 18 hours. When it is 12:00 noon in Sydney, it is 18:00 in Seattle. Sydney uses the Australia/Sydney time zone (UTC+11), while Seattle uses America/Los_Angeles (UTC-7).
With a 18 hours gap, there is no standard business-hours overlap between Sydney and Seattle. 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 Sydney time to Seattle time. Rows highlighted in green indicate overlapping business hours in both cities.
| Sydney | Seattle | |
|---|---|---|
| 00:00 | 06:00 (-1 day) | Night |
| 01:00 | 07:00 (-1 day) | Night |
| 02:00 | 08:00 (-1 day) | Night |
| 03:00 | 09:00 (-1 day) | Night |
| 04:00 | 10:00 (-1 day) | Night |
| 05:00 | 11:00 (-1 day) | Night |
| 06:00 | 12:00 (-1 day) | |
| 07:00 | 13:00 (-1 day) | |
| 08:00 | 14:00 (-1 day) | |
| 09:00 | 15:00 (-1 day) | Overlap |
| 10:00 | 16:00 (-1 day) | Overlap |
| 11:00 | 17:00 (-1 day) | |
| 12:00 | 18:00 (-1 day) | |
| 13:00 | 19:00 (-1 day) | |
| 14:00 | 20:00 (-1 day) | |
| 15:00 | 21:00 (-1 day) | |
| 16:00 | 22:00 (-1 day) | |
| 17:00 | 23:00 (-1 day) | |
| 18:00 | 00:00 | |
| 19:00 | 01:00 | |
| 20:00 | 02:00 | |
| 21:00 | 03:00 | |
| 22:00 | 04:00 | Night |
| 23:00 | 05:00 | Night |
Both Sydney and Seattle 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. Seattle is 18 hours behind Sydney.
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.
Subtract 18 hours from Sydney time to get Seattle 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.