Calendar-Based Backtesting: an Event-Driven Trading EA
This professional-grade solution for MetaTrader 5 helps traders achieve greater efficiency in their daily workflow. This library provides a collection of modular, reusable code. It is utilized by developers to organize common functions, allowing for the integration of complex logic across multiple Expert Advisors, indicators, or scripts without the need for code duplication.
How to Setup and Use Calendar-Based Backtesting: an Event-Driven Trading EA
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
Description & Settings
The code is full of comments for better understanding. This Description explains the main idea, and the ways to use/reuse the code. This framework consists of three key components:1. CalendarRetriever.mq5 (Script) – This script fetches past economic news events and saves them to files in the "Common" folder of your terminal. These files will later be read by the expert advisor during backtesting. The script requires two input parameters:
Start Date – The date from which past news events should be retrieved.
End Date – The last date for which news events should be stored After running this script, it will generate a "Calendar" folder in the "Common" directory of the terminal the following text files will be then created:
Countries.txt – Contains information about each MQLCalendarCountry
Events.txt – Stores event details such as name, impact and countryid.
News.bin – Holds historical news event values, including timestamps. 2. CalendarFile.mq (Include File) – This file provides a structured way to handle news data in the expert advisor. It contains two main classes:
CalendarFileWriter – Used internally by the script to store news data.
CalendarFileReader – Used in the expert advisor to read and process news data. It includes functions to load event data and track upcoming news in the OnTick function. 3. NewsBacktest.mq5 (Expert Advisor) – This EA uses the stored data to simulate real-time news conditions in the strategy tester. It reads the saved news data using the Load functions and executes trades accordingly. How to Use the Framework:
Run the CalendarRetriever Script: Select the Symbol you'd like to backtest and run the CalendarRetriever.mq5 script, with the specified start and end date.
The Expert Advisor
The EA uses the CalendarFileReader class to load the data using these functions:
LoadEvents() – Loads event details.
LoadCountries() – Loads country information.
LoadValues() – Loads historical news values.
It then processes the news events in the OnTick function to determine when a news event is happening. Use Propagate() to predict, Track() to react.
The CalendarFileReader.Propagate() function will set the next index to the next upcoming event, this should be called on each tick.
The CalendarFileReader.Track() function returns true when a news event has passed and sets the last index to that particular event. Also called in the OnTick() function, but the result should be checked.
Backtest the Strategy Open the Strategy Tester in MetaTrader 5, Select NewsBacktest.mq5 and Run the Backtest in Visual Mode
How to Adapt It to Your Own News-Based Strategies:
This framework is designed to be flexible, allowing traders to develop their own strategies around economic news events. Here are some ways you can modify it:
Adjust the event filtering logic in OnTick() to react to specific news types (e.g., only trade after NFP or CPI releases).
Modify the order execution logic to implement different strategies, such as fading the initial move instead of breakout trading.
Use additional indicators alongside news events to refine entry signals.
Change the expiration time of pending orders based on event impact level.
This solution makes backtesting news-based strategies as realistic as possible within the limitations of MetaTrader 5. By first retrieving historical news data and then simulating its impact on the market, traders can gain valuable insights into how their strategies would perform in live conditions.
