When markets really open?

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I am little confused about market sessions. I am working on market session indicator and when I googled when markets opening, for example New York, I found that it opens 09:30. But on Forex Factory website, it seems that NY opens at 08:00 and even I looked in some of MT4 indicators and their NY session start time was 08:00. So, when NY actually opens? Which time should I set for my indicator?
 
https://www.forexmarkethours.com/
 
Eleni Anna Branou:
https://www.forexmarkethours.com/

So, as  I can see sessions are different between Stock market and Forex market. That's what I got wrong, NYSE opens at 09:30 not forex market. Hmm ...

 

Chart times are broker times.


  2. Foreign Exchange (FX) market opens 5 PM New York (NY)/Eastern Time (ET) Sunday and ends 5 PM NY Friday. Some brokers start after (6 PM is common) and end before (up to 15 minutes) due to low volatility.

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    Swap is computed 5 PM ET. No swap if no open orders at that time.

  3. Brokers use a variety of time zones. Their local time, with or without Day Light Savings Time (DST), London, UTC, London+2, UTC+2, NY+7.

    Only with NY+7 does the broker's 00:00 equals 5 PM ET and the start of a daily bar (and H4) is the start of a new FX day.

    GMT/BST brokers, means there is a 1 or 2 hour D1/H4 bar on Sunday (depending on NY DST), and a short Friday bar. (Problems with indicators based off bars.)

    GMT+2 is close but doesn't adjust for NY DST.

    EET is closer except when their DST doesn't match NY's. Last Sunday of March and 1:00 on the last Sunday of October vs second Sunday in March and return at 2:00 AM EDT to 1:00 AM EST on the first Sunday in November.

  4. Non-NY+7, means the chart daily bar overlaps the start, and converting broker time to NY time requires broker to UTC to NY timezone conversions.

  5. If you search the web you will find differing answers. Those are all wrong (half the year) because they do not take DST into account (or that it changed for the US in 2007 [important when testing history.])

  6. Then there are (non-24 hour markets) with H4 candles that start on odd hours.
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