Open a EUR/USD chart on a one minute timeframe and scroll back through a full 24 hours. You will see a band of small, overlapping candles through the Asian hours, a step change in candle size shortly before 08:00 London time, and a second burst in the early afternoon. Same instrument, same broker, same spread setting. What changed is who was sitting at the desk.
Currencies have no central exchange and no opening bell. Trading is passed from one regional banking centre to the next as local business hours begin, from Sunday evening in Sydney to Friday evening in New York. So the question is never whether the market is open. It is how much size is standing behind the price you are about to hit.
Four centres, one continuous book
Sydney starts the week. Tokyo follows, then Singapore and Hong Kong, then London, then New York. Bank dealing desks staff their currency books during local office hours, which is why a currency tends to be most actively priced while its home market works. The yen has its tightest, deepest market during Tokyo hours. Sterling behaves like a different instrument once London sits down.
| Session | Approx. hours (UTC) | What it usually looks like |
|---|---|---|
| Sydney | 21:00 to 06:00 | Thin book, narrow ranges, AUD and NZD data |
| Tokyo | 00:00 to 09:00 | JPY flow, the Tokyo fix, majors often range bound |
| London | 07:00 to 16:00 | Largest turnover, widest ranges in EUR and GBP |
| New York | 12:00 to 21:00 | US data releases, overlaps London until 16:00 |
Treat those hours as conventions, not rules. They also move. Europe and the United States switch to daylight saving on different dates, so for two or three weeks each spring and autumn the overlap sits an hour away from where your notes say it should. Platforms make this worse by displaying server time, which is commonly GMT+2 or GMT+3. Before any session based rule is worth testing, work out exactly what your 08:00 candle corresponds to in London.
The overlap is where the size is
Roughly 12:00 to 16:00 UTC, both the European and the North American books are open at once. That is the deepest part of the day: the most counterparties quoting, the tightest spreads on the majors, and the point at which a large order can be worked without dragging the price. It is also where the calendar puts the events that matter. United States payrolls, inflation prints and the Federal Reserve statement all land in that window, which is why the first Friday of the month has a rhythm of its own.
Bigger ranges are not automatically better. Depth cuts both ways: more participants means faster repricing, and a stop placed inside a data spike gets filled at whatever the book offers, not at your level. If you want to understand why the same stop survives at 03:00 and gets taken at 13:30, read the mechanics of liquidity in the currency market before blaming the broker.
Asia is quiet until it is not
Calling the Asian session "dead" is a habit picked up from watching EUR/USD alone. On yen crosses and the Australian dollar, Tokyo hours carry real order flow: exporter hedging, the 09:55 Tokyo fix, Bank of Japan and Reserve Bank of Australia decisions, Chinese data. Month end and quarter end fixing flows can move majors sharply in hours when a European trader has already closed the laptop.
The practical difference is that ranges tend to be compressed and mean reverting, so strategies built on continuation often perform badly and range strategies often perform well. That compression is also what makes the following hours interesting, because the Asian range gives the European open something to break. The London breakout approach is built entirely on that handover.
Rollover: the minute nobody plans for
At 17:00 New York time, the market rolls to the next value date. Open positions have swap applied, interbank liquidity thins for a few minutes, and quoted spreads on retail platforms can multiply. If your platform runs on GMT+2, that moment shows on your chart at 23:00 or 00:00 depending on the season, which is why so many traders see an inexplicable spike on the daily candle boundary.
Nothing has gone wrong. It is the daily accounting reset of a market that never closes, and it explains both the swap line on your statement and the strange wick. The detail is worth learning properly, because a stop sitting a few pips away during the rollover window can be triggered by a spread that never touched a traded price.
Session hours describe liquidity conditions, nothing more. They do not predict direction, and a strategy that only works during one window has been fitted to a small sample. Leveraged trading carries a high risk of loss regardless of what time you place the order.
Pick one window and defend it
The most useful thing a session map does is narrow the day. A trader who works European hours and tries to also catch New York closes has two hours of real attention spread across nine. Choosing a fixed three or four hour window makes the sample comparable: the same liquidity conditions, the same typical range, the same news pattern week after week. That is what makes a journal readable after thirty trades instead of noise.
For firms rather than individuals, the session map turns into an operational schedule. Support staffing, liquidity provider sessions, swap application times and the daily bar close all have to agree, and platforms that let you set the server session and rollover hour per server, as eTrader does, save a lot of reconciliation arguments later. Get the clock wrong and every downstream report inherits the error.
"Most people do not have a strategy problem, they have a time zone problem. They trade whatever hour they happen to be free, then wonder why the same setup worked in March and stopped working in July."
— Alex Onta, Executive Director, SINGUARD
Key Takeaways
- Forex has no exchange hours, only banking centres handing the book from Sydney to Tokyo to London to New York.
- The London and New York overlap, roughly 12:00 to 16:00 UTC, holds the tightest spreads and most scheduled US data.
- Asian hours are thin on EUR/USD but carry genuine flow on yen crosses, AUD and NZD around fixes and central bank decisions.
- Map your platform's server time to London and New York before testing any session rule, and re-check it after daylight saving changes.
Frequently Asked Questions
What time do the forex trading sessions open and close?
In approximate UTC terms, Sydney runs 21:00 to 06:00, Tokyo 00:00 to 09:00, London 07:00 to 16:00 and New York 12:00 to 21:00. These are conventions rather than exchange hours, because forex has no central exchange, and they shift by an hour when Europe or the United States changes to daylight saving on different dates.
Which session has the most liquidity?
London carries the largest share of daily currency turnover, and the busiest few hours of the day are the window when London and New York are both open, roughly 12:00 to 16:00 UTC. Spreads are usually at their tightest in that overlap and depth is deepest, which is also why most scheduled United States data lands inside it.
Why do spreads widen at 22:00 or 23:00 on my platform?
That is rollover, the daily reset at 17:00 New York time when positions are rolled to the next value date and swap is applied. Bank liquidity thins for a few minutes around the changeover, so quoted spreads can widen sharply. It is a normal feature of the market rather than a broker fault, but it is a poor moment to place market orders.