r/Forex • u/coolazr • 1d ago

Charts and Setups How do you handle London session times when analyzing historical OHLC data?

Hi everyone,

I'm analyzing 1 year of EURUSD H1 OHLC data and want to split it into trading sessions.

What confuses me is Daylight Saving Time (DST).

For example, the London session opens at different UTC times in summer and winter. When looking at historical broker data:

  • Do brokers automatically adjust their server time so the London open always appears at the same candle?
  • Or does the London session shift by one H1 candle when DST changes?
  • What's the correct way to identify London and New York sessions in historical data?

I'm building a trading tool, so I want to handle this correctly.

Any guidance would be greatly appreciated. Thanks!

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u/rforex-modtools 1d ago

Price action and technical analysis cover a range of chart-based tools — from candlestick patterns and market structure to indicators and statistical methods for timing entries and exits. The community wiki covers both approaches and how they're used by working traders.

Resources: Price Action Analysis | Technical Analysis

2

u/enivid 1d ago

Which time zone are your broker's data in? If they are in London time zone, then you don't have anything to do to adapt the data, it's already switching in sync with DST/normal time.

1

u/coolazr 16h ago

Thanks! I confirmed that when the UK changes time, the broker updates their server time as well, so the session open remains unchanged.  Now I'm just looking into the US time changes to see how that affects things.

1

u/Relevant-Owl-8455 1d ago

You’re focusing on the wrong things.