Best Time to Call Australia from the US
Australia Eastern Time is 15 hours ahead of US Eastern Time. Both countries observe Daylight Saving Time but on opposite hemispheric schedules — US spring is Australia’s fall. The offset shifts twice a year, sometimes narrowing, sometimes widening the gap. This guide shows exactly when to call and how to handle the dual-DST complexity.
Time Difference Overview
Both the US and Australia observe DST, but their clocks shift in opposite directions at different times of year. The US is on standard time November–March, while Australia observes daylight time October–April. This means the offset fluctuates throughout the year, ranging from roughly 14 to 19 hours depending on your US zone and the season.
Eastern Time (ET)
Central Time (CT)
Pacific Time (PT)
Australian Eastern Time (AEST)
Key detail: Australia is roughly 15 hours ahead of the US East Coast right now. Your US late afternoon or evening is Australia’s next morning — making 5–7 PM Eastern the sweet spot that catches 8–10 AM Sydney the following day. The date line means when you call in your US evening, it is already tomorrow in Australia.
Work Hours Overlap
Visual timeline showing 9 AM – 6 PM work hours for each US time zone and Australia Eastern, with overlap highlighted.
The overlap between US Eastern and Australia Eastern business hours is extremely limited. The best window is early US evening (5–7 PM ET) which catches Australia’s morning (8–10 AM AEST next day). US Pacific teams actually have a slight advantage — 3–5 PM PT aligns with the same Sydney morning window.
ET to AEST Conversion Table
Full 24-hour comparison. Business hours (9 AM – 6 PM) are highlighted.
| ET | AEST |
|---|---|
| 12:00 AM | 3:00 PM |
| 1:00 AM | 4:00 PM |
| 2:00 AM | 5:00 PM |
| 3:00 AM | 6:00 PM |
| 4:00 AM | 7:00 PM |
| 5:00 AM | 8:00 PM |
| 6:00 AM | 9:00 PM |
| 7:00 AM | 10:00 PM |
| 8:00 AM | 11:00 PM |
| 9:00 AM | 12:00 AM +1 day |
| 10:00 AM | 1:00 AM +1 day |
| 11:00 AM | 2:00 AM +1 day |
| 12:00 PM | 3:00 AM +1 day |
| 1:00 PM | 4:00 AM +1 day |
| 2:00 PM | 5:00 AM +1 day |
| 3:00 PM | 6:00 AM +1 day |
| 4:00 PM | 7:00 AM +1 day |
| 5:00 PM | 8:00 AM +1 day |
| 6:00 PM | 9:00 AM +1 day |
| 7:00 PM | 10:00 AM +1 day |
| 8:00 PM | 11:00 AM +1 day |
| 9:00 PM | 12:00 PM +1 day |
| 10:00 PM | 1:00 PM +1 day |
| 11:00 PM | 2:00 PM +1 day |
Best Meeting Times
Top ranked time slots for a 1-hour US East – Australia meeting with standard 9 AM – 6 PM work hours.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for Australia.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for Australia.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for US East.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for US East.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for US East.
Practical Tips for US-Australia Scheduling
With a 15 hours gap and dual-DST complication, US-Australia calls require advance planning and a bit of compromise. These tips help teams make it work.
- Target 5–7 PM ET for the US evening window. This catches 8–10 AM AEST the following morning in Sydney — both sides are in reasonable hours. Australia is starting their day fresh; the US is wrapping up. Earlier US times push Australia too early; later US times run into US evening commitments.
- US Pacific teams have the best alignment. 3–5 PM PT maps to the same 8–10 AM Sydney window, while still being a comfortable mid-afternoon for the PT team. If your US team spans zones, let the PT members lead the Australia call.
- Account for dual-DST shifts twice a year. Both countries change their clocks, but on opposite schedules — US springs forward in March while Australia falls back in April. There are brief windows (late March through April, and October through November) where both are on the same type of time. Track actual calendar dates rather than assuming the offset is fixed.
- Always schedule with IANA names, not UTC offsets. AEST is UTC+10 in winter and UTC+11 (AEDT) in summer. ET is UTC-5 in winter and UTC-4 in summer. Scheduling with raw offsets will break; use America/New_York and Australia/Sydney so your calendar tool computes the correct local times automatically.
- Remember the date line: it is already tomorrow in Sydney. When you call at 6 PM Tuesday in New York, your colleagues in Sydney are answering at 9 AM Wednesday. For project deadlines and end-of-day handoffs, be explicit about which calendar day you mean — “EOD Tuesday your time” or “before Wednesday AEST.”
- Use async for non-urgent items given the extreme gap. With so little overlap, reserve real-time meetings for decisions that truly require live discussion. Video updates, shared documents, Loom recordings, and async standups eliminate many calls that do not need both sides simultaneously.
How Dual DST Affects US-Australia Calls
Unlike the US-India corridor where only one side observes DST, both the US and Australia shift their clocks — but in opposite seasons (northern vs. southern hemisphere). This creates four distinct offset phases across the year:
- US winter + Australia summer (Nov–Mar): US on standard time, Australia on daylight time. Gap is at its narrowest — roughly 16 hours ET to AEDT. A 5 PM ET call reaches 9 AM AEDT next day.
- US summer + Australia winter (Apr–Oct): US on daylight time, Australia on standard time. Gap widens to roughly 14 hours EDT to AEST. A 5 PM EDT call still reaches 7 AM AEST next day — slightly earlier for Australia.
- Transition gap weeks (late March, late October): The two countries switch at different times, creating a brief period where the offset is in an intermediate state. In late March, the US has sprung forward but Australia has not yet fallen back — the gap briefly widens by one hour. Always verify during these weeks.
The next US transition is fall back on November 2, 2026. The next Australian transition is fall back on April 6, 2026. See our DST calendar for complete transition dates.
Related Resources
- Meeting Planner — Find the best overlap window with custom work hours for your specific team.
- How US DST Affects International Teams — Detailed breakdown of spring/fall transitions for global teams.
- DST Transition Dates 2024–2027 — Complete DST dates for Australia, US, EU, and more.
- Scheduling Across Time Zones — Best practices for fairness and reducing late-night calls.