Direct answer: London session forex time in EST
The “London session” in forex refers to the period when the London financial markets are open and liquid. To express that in Eastern Time (ET), you must first decide whether you mean EST (UTC−5) specifically or ET in general.
- If the date is in a period where London is on GMT/UTC (no UK daylight saving) and the US is on standard time (EST, UTC−5), then the London session hours translate directly to EST by using the same clock time in UTC.
- If the US is on daylight saving (EDT, UTC−4) while London is still on standard time, or if London is on daylight saving (BST, UTC+1) while the US is on standard time, the EST offset changes by an hour.
Because daylight-saving dates differ by year and location, the only fully reliable way to state “London session start/end in EST” for a particular day is to calculate the timezone offset for that specific date or check a trusted “market hours” source that publishes the session times in your timezone.
How it works: converting London session time to EST
- Start with London market hours in London local time (often described as a daytime trading window during the business week).
- Determine the relevant UK timezone on that date:
- GMT during UK standard time
- BST during UK daylight saving time
- Determine the relevant U.S. Eastern timezone on that date:
- EST during U.S. standard time
- EDT during U.S. daylight saving time
- Apply the UTC offset difference between London and Eastern time.
In practice, many readers get tripped up by mixing EST (standard time) with ET (which includes daylight time). If you want “EST specifically,” use the date’s timezone rules to ensure you are not accidentally one hour off.
Example checks you can do
- If you see a London session schedule listed in UTC or London local time, convert it to EST using the date’s UTC offsets.
- If you are using broker platform “market hours” for forex, compare the displayed session window to the conceptual London session window. Brokers may present slightly different cutoffs based on liquidity hours and instrument availability.
- For recurring planning, note that “London session in EST” can shift by about one hour when daylight saving changes in either the UK or the US.
Limitations and what you should verify
- This answer describes the timezone mechanics and the key limitation: EST timing depends on daylight saving on the specific date.
- Session boundaries can also vary by source (for example, whether a schedule uses exact opening/closing moments or broader “liquidity windows”).
- For any day you trade or analyze, independently verify the session window using a current, date-specific market-hours reference (such as your broker’s trading hours display).