Why Daylight Saving Time Changes Shift Forex Trading Sessions

Educational content. This article explains how daylight saving changes shift the clock times of forex, index and commodity sessions. It does not constitute investment advice or a recommendation. CFD trading carries significant risk of loss and may not be suitable for all investors.

Daylight saving time shifts forex sessions because the financial centres change their local clocks, while the market itself keeps trading. In UTC, the London and New York sessions open one hour earlier in summer, Tokyo does not move, and Sydney moves in the opposite season. The change dates differ by country, so the session map is briefly different for a few weeks each year.

This article is about the mechanism and the calendar: which clocks move, when, and what that does to overlaps, economic releases, the daily rollover and the MT5 server time. The standard session hours are in forex trading sessions; this page does not repeat them. All times below are computed from the IANA time zone database for 2026, and they are arithmetic, not forecasts.

Which Clocks Move and Which Do Not?

Only the clocks of regions that observe daylight saving move; UTC never moves, and the market follows the opening hours of each financial centre in its own local time. A bank dealing room in London opens at 08:00 London time all year. In summer, London time is UTC+1, so that opening falls at 07:00 UTC. In winter, London time is UTC+0, so it falls at 08:00 UTC.

That is the whole mechanism. Nothing about liquidity, volume or volatility changes on the transition date. What changes is the number on your clock at which a given centre becomes active.

Sydney is the trap in this table. Its "summer" is the northern winter, so its offset is UTC+11 from 4 October 2026 to 4 April 2027, then UTC+10. Traders in Singapore, Hong Kong, Thailand, Vietnam, Indonesia, the Philippines, Malaysia and Japan do not change their own clocks, which means the shift always arrives from the other side of the world while your own clock stays still.

How Far Do the Sessions Move in UTC?

The London and New York opens move by exactly one hour in UTC, Tokyo moves by zero, and Sydney moves by one hour in the opposite direction. The table gives the UTC time of an 08:00 local open (09:00 in Tokyo, as in the common session maps) on typical winter and summer dates in 2026.

Computed from the IANA time zone database, 10 October 2026. Local opening times are illustrative reference points for the arithmetic, not official exchange or dealing hours.

Two rows deserve attention. On 15 March, New York has already moved but London has not. On 28 October, London has already moved back but New York has not. Those are the mismatch weeks.

What Happens in the Mismatch Weeks?

For 21 days in spring and 7 days in autumn, London and New York are 4 hours apart instead of 5, because the two regions change their clocks on different dates. In 2026 the dates were:

The US rule is the second Sunday of March to the first Sunday of November; the UK and EU rule is the last Sunday of March to the last Sunday of October. From 8 March to 29 March the United States is on summer time and Europe is not. From 25 October to 1 November Europe is back on winter time and the United States is not.

A worked example with the London close at 17:00 London time and the New York open at 08:00 New York time:

• Normal gap (5 hours): New York opens at 13:00 UTC in winter, London closes at 17:00 UTC. Overlap = 17:00 - 13:00 = 4 hours. In summer both shift by one hour, so the overlap is the same 4 hours, from 12:00 to 16:00 UTC.
• Mismatch gap (4 hours), spring: New York is on summer time, so it opens at 12:00 UTC. London is still on GMT, so it closes at 17:00 UTC. Overlap = 17:00 - 12:00 = 5 hours.

So in the mismatch weeks the overlap in UTC is a full hour longer than usual, and it starts an hour earlier relative to the London opening. This is clock arithmetic on stylised 08:00 to 17:00 local hours. It says nothing about how liquid that extra hour is; actual depth depends on what each market is doing at the time. See spreads for what drives the cost of trading through a session.

The Sydney to London gap shows the same effect over a longer cycle, because the two regions are in opposite seasons:

As of 10 October 2026 the market is in the 10-hour row. The next changes are the UK and EU return to winter time on 25 October and the US return on 1 November, which together close the autumn mismatch week.

How Do the Shifts Move Economic Releases and Index Opens?

A release fixed to a New York or London clock time moves by one hour in UTC, and therefore in your local time if you live where clocks do not change. The US Non-Farm Payrolls report is published at 08:30 New York time. In summer that is 12:30 UTC, and in winter it is 13:30 UTC. Using UTC+8 (Singapore, Hong Kong) and UTC+9 (Japan) as examples:

The release is at the same moment on the New York clock, and it only "moves" for someone counting from a clock that does not change. For what the release itself does to the dollar, see how NFP affects the US dollar.

The same logic applies to cash index sessions. European cash markets follow the EU dates, so the CAC 40 and its neighbours move together; the CAC 40 article notes that Paris is UTC+1 in winter and UTC+2 in summer. US index sessions follow US dates, so an index CFD tied to the S&P 500 opens one hour earlier in UTC after 8 March than before it, whatever Europe is doing that week. In the mismatch weeks, European and US cash opens are 4 hours apart in UTC terms rather than the usual 5 hours (the cash sessions sit on the same clocks as the dealing hours above).

Commodity data follows the same rule. Weekly US inventory reports are tied to a New York clock time, so their UTC time moves with the US dates, a point covered for oil in the Brent oil article.

Why Does the Daily Rollover Move in UTC?

The forex trading day rolls over at 17:00 New York time, which is 21:00 UTC in summer and 22:00 UTC in winter. That is why the end of the day in UTC is not a fixed number. The 17:00 New York convention is the standard market day boundary, and it moves with US daylight saving.

An MT5 server can be set to follow it. On the platform Vanto uses, the server clock is New York time plus 7 hours, so 17:00 New York is exactly 00:00 server time. This gives UTC+3 in US summer time and UTC+2 in US winter time, with the switch on the US dates rather than the EU dates. The result is that the daily candle always closes at 17:00 New York and the server's day boundary is anchored to it.

Three practical consequences follow, and all three are structural, not numerical:

1. Server time drifts against your local time. If you live in a zone without daylight saving, the gap between your clock and the server clock changes by one hour twice a year, on US dates. On a platform with a 5-day trading week, check the server time shown in the Market Watch window after each US change before relying on a time-based rule.
2. Daily candles and swap follow the server day. Swap is applied when a position is carried through the rollover between server days. Because the server day is anchored to New York, the rollover moment holds its place on the New York clock and moves in UTC.
3. The triple-swap weekday does not move. The multiplier is attached to a weekday of the server calendar, not to a UTC hour, so a daylight saving change shifts the clock time of the rollover but not the day on which the triple charge falls. The weekday rules by asset class are in what is triple swap day.

Vanto feed snapshot, 10 October 2026, triple-swap weekday by asset class:

Each day is a server calendar day, so the table is the same in summer and in winter.

When Does the Rule Break?

The one-hour rule breaks whenever a session is not tied to a daylight saving clock, or when the data you rely on is quoted in a different time. These are the common ways it fails:

• Treating "GMT" tables as fixed. Many session charts are labelled GMT but are drawn for summer or for winter. Check which season a chart assumes, as the session hours article does for its approximate table.
• Assuming one switch date. The US and UK/EU change on different Sundays, and Australia changes in the other season. Any rule built on "the clocks change on one date" is wrong for three weeks in spring and one week in autumn.
• Forgetting that Tokyo does not move. Japan observes no daylight saving, so the Tokyo session is fixed in UTC and instead shifts relative to London and New York. A pair such as USD/JPY sees its two home sessions drift apart by an hour when the US moves.
• Mixing server time with local time in a backtest or alert. A rule written as "close at 23:00 server time" refers to 20:00 UTC in one season and 21:00 UTC in the other, if the server follows US dates. Exact opening and closing times for each instrument are in the instrument specification in the platform.
• Assuming the change is a market event. Clocks change in the early hours of a Sunday, while the forex market is still closed, and the shift itself carries no information about price direction.

What Should You Check After a Clock Change?

Three checks cover almost everything: the server time against UTC, the UTC time of any scheduled release you watch, and any time-based order or alert you set. This is a verification routine, not a trading rule.

1. Open the Market Watch window and compare the server time with UTC. The offset should be UTC+3 in US summer time and UTC+2 in US winter time on the platform described above.
2. Re-derive each release time from its New York or London clock time, not from last season's UTC time.
3. Re-check any alert, expert advisor schedule or time filter written in server or local time.

For positions held through the change, leverage amplifies losses as well as gains, and a session that opens an hour earlier or later than expected can change how a position behaves at the open. See slippage for how fills differ from the expected price when liquidity is thin.

Frequently Asked Questions

Does daylight saving time change when the forex market is open?

No. The market stays open 24 hours a day from Sunday evening to Friday evening in UTC, as it is made of regional sessions. What changes is the UTC time at which London and New York become active, which shifts by one hour.

When do the clocks change in 2026?

The US changed on 8 March and changes back on 1 November. The UK and EU changed on 29 March and change back on 25 October. Sydney changed on 4 October and changes back on 4 April 2027. Japan and most of Southeast Asia do not change.

Why are New York and London sometimes 4 hours apart instead of 5?

Because the two regions change clocks on different Sundays. In 2026 that happened from 8 to 29 March and from 25 October to 1 November, 28 days in total. In those weeks the UTC overlap of 08:00 to 17:00 local hours is 5 hours instead of 4.

What is the MT5 server time and does it change?

On Vanto's platform the server clock is New York time plus 7 hours, which is UTC+3 in US summer time and UTC+2 in US winter time. It changes on US dates, not EU dates, so your gap to server time moves by one hour twice a year if your own clock does not.

Does daylight saving change the triple swap day?

No. The triple-swap weekday is a server calendar day, Wednesday for forex and metals and Friday for indices and energies in the Vanto feed snapshot of 10 October 2026. A clock change moves the rollover in UTC, not the weekday it falls on.

Do cryptocurrencies move with daylight saving?

Crypto CFDs have no session structure that depends on a daylight saving clock, and the Vanto feed snapshot of 10 October 2026 shows no triple-swap day for crypto. Scheduled events that affect them, such as US releases, still follow the New York clock.

Calculate the Numbers Before You Trade

Time shifts change when you can act, not how much a position risks. Use the trading calculator to check margin, pip value and swap exposure for your instrument and lot size before holding a position through a session change. Margin call is 100% and stop-out is 50% on both account types.

Risk warning. Trading securities, futures, options, and contracts for differences are complex financial instruments that require knowledge and understanding. Prices can fluctuate significantly and securities may become valueless. Investors may incur losses exceeding the potential for profits. Trading on margin can result in losses greater than the amount initially deposited. Past performance is not necessarily a guide to future performance. The information in this article is for educational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any financial instrument. Consider whether CFD trading is appropriate for your circumstances and seek independent advice if necessary.