Question 1

What is the best time for a meeting between London, New York and Sydney?

Accepted Answer

London–New York–Sydney is one of the hardest combinations because Australia is roughly opposite New York on the globe. Business hours overlap analysis: London 9am–5pm = New York 4am–12pm (EST) = Sydney 8pm–4am (AEST). There is no time where all three cities are in standard business hours. The least-bad option: London 4pm–5pm = New York 11am–12pm = Sydney 2am–3am (next day). Alternatively: London 7am–8am = New York 2am–3am = Sydney 6pm–7pm (previous day). Most teams with this spread rotate meeting times to share the inconvenience fairly.

Question 2

What is UTC and why is it used for scheduling?

Accepted Answer

UTC (Coordinated Universal Time) is the primary international time standard. It does not observe daylight saving time (DST), making it a stable reference point. When scheduling across time zones: stating a time in UTC avoids DST confusion — 14:00 UTC is always 14:00 UTC, even when countries switch their clocks. UTC offsets: New York UTC-5 (winter) / UTC-4 (summer), London UTC+0 (winter) / UTC+1 (summer), Madrid UTC+1 (winter) / UTC+2 (summer), Tokyo UTC+9 (no DST), Sydney UTC+10 (winter) / UTC+11 (summer). The meeting planner shows UTC times alongside local times.

Question 3

How do I avoid DST mistakes when scheduling international meetings?

Accepted Answer

Daylight saving time (DST) causes recurring scheduling errors because different countries switch dates on different schedules. Common mistakes: (1) The US and UK switch DST on different dates — there is a 2–3 week window each spring and autumn when the US–UK time difference shifts by 1 hour; (2) Australia observes DST in the opposite season from the Northern Hemisphere; (3) Several large countries (India, China, Japan, most of Africa) do not observe DST at all. Prevention: always verify times closer to the meeting date; specify UTC or reference time zones explicitly; use a world clock tool that is DST-aware.

Question 4

What is the golden meeting window between European and US time zones?

Accepted Answer

The 'golden window' — hours when both sides are in standard business hours: Eastern US (EST, UTC-5) + Western Europe (CET, UTC+1): overlap 9am–1pm EST (3pm–7pm CET). Western US (PST, UTC-8) + Western Europe (CET, UTC+1): no standard-hours overlap. PST 9am = CET 6pm, already end of European business day. For US West Coast + Europe meetings, US East Coast intermediaries often join in the morning to cover for the West Coast. Eastern US + UK (GMT, UTC+0): overlap 9am–1pm EST (2pm–6pm GMT) — the most comfortable transatlantic window.

Route	Best window (UTC)	Local times
New York + London	UTC 14:00–18:00	9am–1pm EST / 2pm–6pm GMT
New York + Madrid / Paris	UTC 14:00–17:00	9am–12pm EST / 3pm–6pm CET
London + Dubai	UTC 09:00–14:00	9am–2pm GMT / 1pm–6pm GST
London + Singapore	UTC 09:00–10:00	9am–10am GMT / 5pm–6pm SGT (tight)
New York + Los Angeles	UTC 17:00–21:00	12pm–4pm EST / 9am–1pm PST
Madrid + Sydney	— No overlap —	Madrid 8am = Sydney 5pm; rotate fair

World Clock / Meeting Planner

Common meeting overlap windows

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