ForumSections

MT5 Time Synchronization: Can We Align Broker Server Time with Local PC Time?

New comment

Hello MQL5 Community,

I would like to open a discussion about time synchronization in MetaTrader 5, especially when developing Expert Advisors that depend on trading sessions, daily closing times and scheduled trade management.

Last month, I experimented with the date and time settings on my PC. I noticed that after changing my PC time settings, the server time displayed in my MT5 terminal appeared to align with my local computer time.

This made me wonder whether there is a reliable way to synchronize the MT5 terminal's server time with the local PC time without manually changing the computer's clock or time zone.

I understand that MQL5 provides different time functions, such as:

  • TimeCurrent() – last known broker server time.

  • TimeTradeServer() – calculated current trade server time.

  • TimeLocal() – local computer time.

  • TimeGMT() – GMT time calculated using the computer's time settings.

My questions are:

  1. Is there a recommended way to display broker server time and local PC time together in an EA?

  2. Can we automatically calculate the difference between broker server time and local time?

  3. Is it possible to make an EA adjust its trading sessions automatically according to the user's local time zone?

  4. What is the safest approach when the PC time zone or daylight saving time changes?

  5. Should an EA use broker server time for trade execution and local time only for displaying information?

I am particularly interested in solutions that can work reliably across different brokers and VPS environments.

I would appreciate hearing from experienced MQL5 developers about how they handle time synchronization in their EAs.

Thank you!

Lungile, you can certainly display both times and calculate the difference, but I wouldn't recommend trying to synchronize the broker's server time with your PC clock.

The broker controls its server time, and changing your Windows time settings won't change that. What you probably noticed is the behaviour of TimeTradeServer(), which calculates an estimated server time using your computer's clock. This is different from TimeCurrent(), which returns the last known server time received from the broker.

For an EA, I would generally use TimeCurrent() as the reference for trading decisions and candle/session calculations. You can use TimeLocal() for displaying the user's local time.

Calculating the difference is straightforward:

int offset = (int)(TimeCurrent() - TimeLocal());

Just remember that TimeCurrent() only updates when quotes arrive, so the difference can become inaccurate when the market is quiet or closed.

If you want to support user-defined local trading sessions, I would convert those session times into broker server time rather than trying to change the terminal's clock.

The more complicated part is daylight saving time. Both the user's local offset and the broker's server offset can change independently. Simply calculating the difference once during OnInit() and assuming it remains constant is not reliable, particularly for EAs running continuously on a VPS.

There is also an important Strategy Tester limitation that is often overlooked. During backtesting, TimeLocal(), TimeGMT(), TimeTradeServer() and TimeCurrent() all return the simulated server time. This means an automatic timezone conversion that works in live trading may behave differently in the tester.

For reliable session-based EAs, especially across different brokers, I would keep the trading logic based on a clearly defined time reference and handle timezone and DST conversions separately. Historical testing may require an explicit timezone/DST schedule rather than relying on the built-in time functions.

So yes, displaying and converting between the different times is perfectly possible, but actually synchronizing your broker's clock to your local PC isn't necessary or possible from an EA.

Lungile Mbanjwa:
Is there a recommended way to display broker server time and local PC time together in an EA?

To reference TimeLocal(), TimeTradeServer(), or TimeCurrent() in an EA, see https://www.mql5.com/en/blogs/post/770147

Lungile Mbanjwa:
Can we automatically calculate the difference between broker server time and local time?

To convert time between time zones and display it, see the indicator code at https://www.mql5.com/en/blogs/post/772108

Just be aware that calling multiple forms of real-time simultaneously can be burdensome on the terminal. The indicator is more of a utility for manually tracking DST changes for the purpose of manually adjusting EA time settings. The time filter code snippet referenced above is much more efficient in an EA.

New comment