The time difference between Sydney and Houston is 15 hours. When it is 12:00 noon in Sydney, it is 21:00 in Houston. Sydney uses the Australia/Sydney time zone (UTC+10), while Houston uses America/Chicago (UTC-5).
With a 15 hours gap, there is no standard business-hours overlap between Sydney and Houston. One party will need to adjust their schedule. Early mornings in Sydney or late evenings in Houston tend to be the most practical compromise.
Use this table to quickly convert any hour from Sydney time to Houston time. Rows highlighted in green indicate overlapping business hours in both cities.
| Sydney | Houston | |
|---|---|---|
| 00:00 | 09:00 (-1 day) | Night |
| 01:00 | 10:00 (-1 day) | Night |
| 02:00 | 11:00 (-1 day) | Night |
| 03:00 | 12:00 (-1 day) | Night |
| 04:00 | 13:00 (-1 day) | Night |
| 05:00 | 14:00 (-1 day) | Night |
| 06:00 | 15:00 (-1 day) | |
| 07:00 | 16:00 (-1 day) | |
| 08:00 | 17:00 (-1 day) | |
| 09:00 | 18:00 (-1 day) | |
| 10:00 | 19:00 (-1 day) | |
| 11:00 | 20:00 (-1 day) | |
| 12:00 | 21:00 (-1 day) | |
| 13:00 | 22:00 (-1 day) | |
| 14:00 | 23:00 (-1 day) | |
| 15:00 | 00:00 | |
| 16:00 | 01:00 | |
| 17:00 | 02:00 | |
| 18:00 | 03:00 | |
| 19:00 | 04:00 | |
| 20:00 | 05:00 | |
| 21:00 | 06:00 | |
| 22:00 | 07:00 | Night |
| 23:00 | 08:00 | Night |
Houston is currently observing daylight saving time, while Sydney is on standard time. When Houston switches back to standard time, the difference between these two cities will shift by 1 hour.
The time difference is 15 hours. Houston is 15 hours behind Sydney.
Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.
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 15 hours from Sydney time to get Houston 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.