Houston to Sydney Time Difference
Sydney is 16 hours ahead of Houston. When it's 07:56:52 AM in Houston, it's 11:56:52 PM in Sydney.
How Many Hours Ahead Is Sydney From Houston?
Sydney is 16 hours ahead of Houston. So Houston is 16 hours behind Sydney looking the other way — the same gap, described from the other end.
In practice that means a working day in Houston starts when it is already 1:00 AM the next day in Sydney. The gap is not fixed all year: it becomes 17 hours on Sunday, November 1, 2026, when Houston changes its clocks.
Best Time to Call Houston and Sydney
Standard 9-to-5 hours in Houston and Sydney never overlap, so someone has to take the call outside their working day. The most workable window is 3:00 PM to 10:00 PM in Houston, which is 7:00 AM to 2:00 PM in Sydney.
both at work Houston only Sydney only neither — hours shown along the strip are Houston local time.
Convert a Specific Time
Pick any date and time in Houston to see the exact equivalent in Sydney.
Common Times Converted
Houston time on the left, Sydney time on the right.
Houston to Sydney: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Houston. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Houston | Sydney | Working hours |
|---|---|---|
| 12:00 AM | 4:00 PM | Sydney only |
| 1:00 AM | 5:00 PM | — |
| 2:00 AM | 6:00 PM | — |
| 3:00 AM | 7:00 PM | — |
| 4:00 AM | 8:00 PM | — |
| 5:00 AM | 9:00 PM | — |
| 6:00 AM | 10:00 PM | — |
| 7:00 AM | 11:00 PM | — |
| 8:00 AM | 12:00 AM next day | — |
| 9:00 AM | 1:00 AM next day | Houston only |
| 10:00 AM | 2:00 AM next day | Houston only |
| 11:00 AM | 3:00 AM next day | Houston only |
| 12:00 PM | 4:00 AM next day | Houston only |
| 1:00 PM | 5:00 AM next day | Houston only |
| 2:00 PM | 6:00 AM next day | Houston only |
| 3:00 PM | 7:00 AM next day | Houston only |
| 4:00 PM | 8:00 AM next day | Houston only |
| 5:00 PM | 9:00 AM next day | Sydney only |
| 6:00 PM | 10:00 AM next day | Sydney only |
| 7:00 PM | 11:00 AM next day | Sydney only |
| 8:00 PM | 12:00 PM next day | Sydney only |
| 9:00 PM | 1:00 PM next day | Sydney only |
| 10:00 PM | 2:00 PM next day | Sydney only |
| 11:00 PM | 3:00 PM next day | Sydney only |
Understanding the Houston – Sydney Time Difference
Houston runs on America/Chicago, currently CDT (UTC-5:00). Sydney runs on Australia/Sydney, currently AEDT (UTC+11:00). The gap of 16 hours is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Houston adjusts its clocks and the difference becomes 17 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States · Daylight Saving Time in Australia.
Houston today
Sydney today
Frequently Asked Questions
What is the time difference between Houston and Sydney?
Sydney is currently 16 hours ahead of Houston. That gap becomes 17 hours on Sunday, November 1, 2026, when Houston changes its clocks.
How many hours ahead is Sydney from Houston?
Sydney is 16 hours ahead of Houston. Looking at it the other way, Houston is 16 hours behind Sydney.
What time is it in Sydney when it is 9:00 AM in Houston?
When it is 9:00 AM in Houston, it is 1:00 AM the next day in Sydney.
Is Sydney ahead of or behind Houston?
Sydney is 16 hours ahead of Houston. Sydney reaches each point in the day first, so its working day is already finishing while Houston is still getting started.
What is the best time to call between Houston and Sydney?
Standard business hours in Houston and Sydney do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 3:00 PM to 10:00 PM in Houston, which is 7:00 AM to 2:00 PM in Sydney.
Does the time difference between Houston and Sydney change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to 17 hours on Sunday, November 1, 2026.
What time zones are Houston and Sydney in?
Houston uses the America/Chicago time zone, currently CDT (UTC-5:00). Sydney uses Australia/Sydney, currently AEDT (UTC+11:00).