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Pick a time in one city, see it in another. Daylight saving is handled automatically.
Your browser knows every time zone rule ever published (via the Intl API), including daylight-saving transitions. The converter anchors your time in the source zone, shifts to UTC, then renders in the target zone — no manual DST math.
Yes — conversions use the real zone database, so the March/November transitions in the US and Europe are automatic.
One side entered or left DST. The US and Europe change clocks on different weekends, creating 2–3 weeks a year of odd offsets.
There is none — the three regions barely overlap. 8–10am New York / 2–4pm London / 9–11pm Tokyo is the usual compromise.