MQL4 : TimeDaylightSavings() - How it works ??? | Forex Factory

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MQL4 : TimeDaylightSavings() - How it works ???

  • #1
  • First Post: Edited 8:39am Dec 21, 2025 7:57am | Edited 8:39am
Hi coders,

int DLSSec= TimeDaylightSavings();

I'm a trader in Asia country, the forex market open local time is either 06:00 or 05:00 daily (broker's server time = 00:00). It is in winter period right now, the DLSSEc output = 0 and the forex market open local time is at 06:00.

I checked with 2 AI chatbots, both are giving me totally opposite answers on DLSSec.

AI Chatbot A :-
It said that the DLSSec is applying to and following the broker's server time to adjust, it means that :-
1) if the market open local time is at 06:00 (winter period) and the DLSSEc output = 0.
2) if the market open local time is at 05:00 (summer period) and the DLSSEc output = 3600 (1 hour).

AI Chatbot B :-
It said that the DLSSec is applying to and following the user's computer local time and my host country in Asia has no DLS, therefore :-
1) if the market open local time is at 06:00 (winter period) and the DLSSEc output = 0.
2) if the market open local time is at 05:00 (summer period) and the DLSSEc output = 0.
In other words, DLSSEc output is always 0 throughout the entire year.

Which is the correct answer ? Kindly advise, thanks
  • #2
  • Dec 25, 2025 9:19am Dec 25, 2025 9:19am
Don't know what you want to do about DLS output but at first, DLS only exist for western countries and not in asia country.
Which mean only session time which relative to western country will effective.
So if you experience about market open hour for broker server time is 00:00 AM and your local time is 06:00 AM in winter, it will same on summer too.
Because there is no DLS in asia country and it may be Tokyo session for you when the market is open.
But since from London session, market open hour and close hour will not be same in winter and summer.
Let assume if London session start at 01:00 and end at 10:00 PM to your local time in summer, it will start in 02:00 and end at 11:00 PM to your local time in winter.
Same for USs session too. If it is start at 06:00 PM and end at 03:00 AMto your local time in summer, it will start in 07:00 PM and end at 04:00 AM to your local time in winter.
And most major news events will start at US session 06:30 PM to your local time at summer but it will start at 07:30 PM to your local time at winter.
Only Asia session start and end time still remain unchange no matter it was summer or winter because there is no DLS in asia countries.
Hope this will help you.
  • #3
  • Dec 26, 2025 12:18am Dec 26, 2025 12:18am
Quoting chimoong
Hi coders, int DLSSec= TimeDaylightSavings(); I'm a trader in Asia country, the forex market open local time is either 06:00 or 05:00 daily (broker's server time = 00:00). It is in winter period right now, the DLSSEc output = 0 and the forex market open local time is at 06:00. I checked with 2 AI chatbots, both are giving me totally opposite answers on DLSSec. AI Chatbot A :- It said that the DLSSec is applying to and following the broker's server time to adjust, it means that :- 1) if the market open local time is at 06:00 (winter period) and the...
Today the trade servers of most MT4 and MT5 brokerage companies follow FXT (ForexStandardTime). That's Eastern European Time with DST (Daylight Saving Transitions) of New York. Meaning, server time is the same as in Eastern Europe (Athen, Sofia, Bukarest, Kiev) but Daylight Saving Time switches not at Eastern European Times but at New York times. New York switches a bit different than Europe (1-3 weeks difference). That's made so that resulting market auction times around the world fit in exactly 24 hours of a single day. In your trade server, trading starts at 00:00 EET in the most eastern part of the world (New Zealand) and trading ends at 23:59:59 in the most Western part of the world (west of America in deep waters). The datetime border is somewhere in the Pacific between the westcoast of America and the east cost of New Zealand. EET was chosen because it's just in the middle of those 24 hours.

This timezone management is the only setting that prevents the infamous broken Sunday candles which used to be an issue for traders 10-20 years ago. With FXT there are no broken Sunday candles anymore.

So, the answer of your Chatbot A is kind of right but you need to be aware that your local timezone doesn't matter at all for this setting. Server timezone and local timezone are completely different things and independant of each other.
It takes blood, sweat and enough tears to wash away the blood.
  • #4
  • Dec 31, 2025 6:56am Dec 31, 2025 6:56am
Quoting Vanic
Don't know what you want to do about DLS output but at first, DLS only exist for western countries and not in asia country. Which mean only session time which relative to western country will effective. So if you experience about market open hour for broker server time is 00:00 AM and your local time is 06:00 AM in winter, it will same on summer too. Because there is no DLS in asia country and it may be Tokyo session for you when the market is open. But since from London session, market open hour and close hour will not be same in winter and summer....
Noted with thanks
  • #5
  • Last Post: Dec 31, 2025 6:56am Dec 31, 2025 6:56am
Quoting emmzett
{quote} Today the trade servers of most MT4 and MT5 brokerage companies follow FXT (ForexStandardTime). That's Eastern European Time with DST (Daylight Saving Transitions) of New York. Meaning, server time is the same as in Eastern Europe (Athen, Sofia, Bukarest, Kiev) but Daylight Saving Time switches not at Eastern European Times but at New York times. New York switches a bit different than Europe (1-3 weeks difference). That's made so that resulting market auction times around the world fit in exactly 24 hours of a single day. In your trade server,...
Noted with thanks
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