Best Time to Call Australia from the US

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.

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 the next morning in Sydney: 7–9 AM from early April to early October, 9–11 AM from early November to mid-March. US Pacific teams have a slight advantage: 3–5 PM PT is 8–10 AM in Sydney from early April to early October and 10 AM–12 PM from early November to mid-March.

ET to AEST Conversion Table

Full 24-hour comparison. Business hours (9 AM – 6 PM) are highlighted.

Best Meeting Times

Top ranked time slots for a 1-hour US East – Australia meeting with standard 9 AM – 6 PM work hours.

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Practical Tips for US-Australia Scheduling

With a gap of 14 hours to 16 hours 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 the following morning in Sydney: 7–9 AM from early April to early October and 9–11 AM from early November to mid-March. 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 8–10 AM in Sydney from early April to early October and 10 AM–12 PM from early November to mid-March, 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 (mid-March to early April, and early October to early November) where both are on daylight 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 8 AM Wednesday from early April to early October and at 10 AM Wednesday from early November to mid-March. 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

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.