The forex market never closes between Sunday evening and Friday evening UTC, but it isn't equally active the whole time. Volume and volatility move around the globe in four overlapping blocks tied to when major financial centers open their doors: Sydney, Tokyo, London and New York. Knowing the real UTC windows for each — and which overlap actually matters — tells you when a strategy has a fair chance of working and when you're better off leaving the chart alone.
The four sessions and their UTC hours
Every "session" is really shorthand for the local business hours of that region's banks and institutional desks, so the times below are the commonly used approximations, not an exchange-mandated schedule. They also shift slightly with daylight saving, which is covered in the next section.
- Sydney: roughly 22:00–07:00 UTC (21:00–06:00 UTC during Australian daylight saving, which runs October to April)
- Tokyo: 00:00–09:00 UTC, fixed year-round — Japan does not observe daylight saving
- London: 08:00–17:00 UTC in winter (GMT), shifting to 07:00–16:00 UTC during British Summer Time (late March to late October)
- New York: 13:00–22:00 UTC in winter (EST), shifting to 12:00–21:00 UTC during US daylight saving (mid-March to early November)
Put together, that means there's a rough Sydney/Tokyo overlap in the early UTC hours, a quiet gap through the late Tokyo morning, and then London opening while Tokyo is still trading, before New York joins in the early afternoon UTC. For a broader primer on how these session conventions are defined, BabyPips' market hours lesson is a solid reference. If you don't want to do this math every time the clocks change, the trading session clock shows which sessions are open right now, converted to your own timezone.
Why the times shift twice a year
The UTC boundaries above aren't fixed forever because three of the four regions observe daylight saving, and they don't change their clocks on the same date. The US typically moves in March and November, the UK moves in March and October, and Australia — being in the southern hemisphere — moves in April and October, in the opposite direction to the other two. For a week or two around each transition, sessions that normally line up can be temporarily out of sync by an hour.
This matters most for the London/New York boundary. Most of the year it's a clean four-hour overlap, but during the transition weeks it can compress or shift by an hour until both regions are back on the same footing. It's a minor detail, but it's the kind of thing that quietly throws off a rule like "I only trade the 8am London open" if you're going by your broker's platform time rather than UTC.
The London-New York overlap is where the volume is
Not all session time is equal. When London and New York are both open — roughly 12:00 to 16:00 UTC in the northern hemisphere summer, or 13:00 to 17:00 UTC in winter — a disproportionate share of daily forex turnover happens in that four-hour window. Spreads tend to be at their tightest, price ranges expand, and trends that started in the London morning either continue or reverse hard once US traders arrive.
The Bank for International Settlements' 2025 Triennial Survey put average daily global FX turnover at roughly $9.6 trillion, and a disproportionate share of that trades through the hours when London and New York are both active. It's also the window that swallows the US economic calendar's biggest releases. Non-farm payrolls, CPI and FOMC statements are scheduled to land during this overlap specifically because it's when the deepest liquidity is available to absorb the reaction. That's useful to know even if you never trade the news directly: if you're holding a position through this window, expect more movement than the rest of the day, for better or worse. The economic calendar is worth checking before you size a position that will still be open when New York opens.
Sydney and Tokyo: the quieter half of the day
The Asian session — Sydney into Tokyo, roughly 22:00 UTC through to Tokyo's close around 09:00 UTC — is real trading activity, not dead time, but it behaves differently. Ranges are generally tighter, moves are more contained, and the main scheduled catalysts are Australian and Japanese data plus any lingering reaction to the US close. Pairs involving the yen and Australian dollar are naturally most active here, while EUR/USD and GBP/USD tend to sit in narrower ranges until London wakes up.
That lower volatility isn't a downside for every trader. Range-based and mean-reversion approaches often do better in a session that isn't constantly trying to break out, and it's a natural session for traders in Asia-Pacific timezones who want to trade during their own daytime rather than staying up for London or New York hours.
Matching the session to your actual strategy
The session question that matters isn't "which session is best" in the abstract — it's which session fits the strategy and holding period you actually use.
- Scalpers and short-term breakout traders generally want the London/New York overlap: tight spreads, fast fills and enough range in an hour to make a small target worthwhile.
- Swing traders holding for days care less about any single session and more about which session tends to set the tone — London for European macro trends, New York for anything tied to US data or risk sentiment.
- Range traders often prefer the calmer Asian session precisely because price is less likely to blow through a level on stray volatility.
- News-driven traders plan around the release calendar first and the session second, since a single data point can matter more than which session it falls in.
Trading a scalping system during the Tokyo lull, or expecting a quiet range strategy to hold up through a London/New York NFP release, is a common way to turn a perfectly reasonable strategy into a losing one simply by running it in the wrong window.
Building session awareness into your routine
Session timing is easy to get right once and then forget about as the clocks change under you. It's worth building it into a routine rather than relying on memory: check which session you're actually trading in before you place a trade, note it in your trading journal alongside the outcome, and periodically review whether your results cluster in a particular window. Many traders discover after a few months of logged trades that they're consistently profitable in one session and consistently break-even or worse in another — information that's hard to see trade-by-trade but obvious once it's aggregated.
If gold is part of your instrument mix, session timing works a little differently again since XAU/USD responds to both US real-yield moves and broader risk sentiment; the best time to trade XAU/USD guide covers that separately. For pure forex pairs, sizing the trade correctly for the volatility of the session you're in matters as much as the entry itself — the position size calculator can help keep risk consistent whether you're trading the calm Tokyo hours or the fast London/New York overlap.
None of this requires memorizing a table of UTC times. What matters practically is knowing that liquidity and volatility are not evenly spread across the trading day, that the London/New York overlap carries an outsized share of both, and that your strategy's holding period and entry style should point you toward the session that actually suits it rather than whichever hours happen to be convenient for your timezone.