Forex Market Hours Converter (DST-Aware)

Forex hours are overlapping reference windows, not one exchange schedule

Spot foreign exchange is primarily an over-the-counter market. The Bank for International Settlements describes FX activity as decentralised and fragmented across dealers and venues. That structure is why there is no single global opening bell whose status this page can report. Activity moves through financial centres during the working week, while each broker, dealer, venue and instrument can apply its own availability, maintenance and holiday rules.

The converter therefore uses four plainly labelled editorial reference windows. For the selected calendar date, it creates each window in the named financial centre's IANA time zone and then converts the two boundary instants into the display zone you enter. Each boundary is resolved separately. This matters when daylight-saving rules change, because London, New York and Sydney do not always change clocks on the same dates.

Reference session	IANA zone	Centre-local convention
Sydney	Australia/Sydney	08:00–17:00
Tokyo	Asia/Tokyo	09:00–18:00
London	Europe/London	08:00–17:00
New York	America/New_York	08:00–17:00

These stable nine-hour windows make conversion and overlap comparison reproducible. They do not define official liquidity, broker availability or a universal session standard. A Saturday or Sunday calculation is retained as a weekend reference only; it is never labelled open or closed.

Why the displayed hours move during the year

An IANA identifier such as Europe/London identifies a rule history, while an abbreviation such as BST, EST or AEST can be ambiguous and can describe only one offset. The IANA Time Zone Database is updated when civil authorities change offsets or daylight-saving rules. The converter uses the time-zone data available to the deployed JavaScript runtime and shows the numeric UTC offset with the converted result.

The United States and United Kingdom change clocks on different schedules. NIST records the 2026 US transitions as March 8 and November 1. The UK government records its 2026 changes as March 29 and October 25. For part of March, New York has moved forward while London has not. For several days in autumn, London has moved back while New York remains on daylight time. During these mismatch intervals, the difference between the two reference-session starts is four hours instead of five, so their reference overlap grows from four hours to five.

Example date	London in UTC	New York in UTC	Reference overlap
6 March 2026	08:00–17:00	13:00–22:00	4 hours
16 March 2026	08:00–17:00	12:00–21:00	5 hours
6 April 2026	07:00–16:00	12:00–21:00	4 hours
26 October 2026	08:00–17:00	12:00–21:00	5 hours
2 November 2026	08:00–17:00	13:00–22:00	4 hours

How to use the converter without losing the assumptions

1. Choose the calendar date you need rather than assuming today's offset applies to a historical or future event.
2. Enter a full IANA display zone such as Asia/Kolkata, America/New_York or Australia/Sydney.
3. Select the reference sessions you want and choose a 12-hour or 24-hour display.
4. Read both the converted clock time and numeric UTC offset. A result can cross midnight or appear on another local date.
5. Copy the summary when sharing the answer so the date, IANA zone and reference-only limitation travel with the times.

For scheduled data, first verify the release timestamp with the publisher and then use the economic-calendar workflow. For backtests and journals, preserve the zone and offset alongside the timestamp. A bare value such as “8:30” cannot be reproduced after daylight-saving changes without its calendar date and zone.

The New York 17:00 marker is a rollover reference

The optional marker converts 17:00 in America/New_York. It does not call that instant a universal market close. Foreign Exchange Committee minutes published by the Federal Reserve Bank of New York discuss historically lower liquidity around 16:00–18:00 ET and note that many platforms pause around 17:00–18:00 to reset their trading day, while some platforms use different maintenance periods. Your broker's server day, swap process and symbol schedule can differ.

An exchange or venue can publish exact rules for its own products. For example, CME Group publishes product and holiday trading hours. Those rules should be used for the relevant venue; they do not automatically define every retail OTC broker's schedule.

What the result deliberately does not answer

The tool does not consume broker symbol hours, holidays, emergency notices, maintenance windows, spreads, liquidity or live venue status. It cannot tell whether an order can be accepted or filled. Civil-time results also depend on the IANA release installed in the production runtime, so historical and future outputs should be rechecked after material time-zone database changes.

When a copied workflow spans regions, retain the source timestamp, broker timestamp, account server zone and event sequence separately. A session label can help group observations, but it cannot identify why an order was delayed, rejected or filled at another price. Use the trading journal workflow to preserve the evidence and the slippage calculator to measure a defined price difference.