Day of Week Function
Info
The Day of Week Function is a Library for MetaTrader 5 that the 'day of week' function is designed to determine the required month based on the day of the week and its occurrence within that month. For instance, it can identify the third Friday in February 2026 or the fourth Wednesday in November 2026.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Libraries folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use Day of Week Function
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.
What this tool does
The 'day of week' function is designed to determine the required month based on the day of the week and its occurrence within that month.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Library works on MetaTrader 5. Place the file in the MQL5/Libraries folder and restart the terminal.
Description & Settings
Related: hash functions library for metatrader 5 - another powerful library for MetaTrader 5 traders.
The 'day of week' function is designed to determine the required month based on the day of the week and its occurrence within that month. For instance, it can identify the third Friday in February 2026 or the fourth Wednesday in November 2026.Also recommended: Color Conversions and Functions - similar library with strong performance on MetaTrader 5.
This function was conceived while developing an indicator that required handling various dates associated with specific days of the week. A notable example is Martin Luther King, Jr. Day, celebrated on the third Monday of January. Standard functions were inadequate for finding such dates.
Since days of the week repeat every 28 years, one approach could be to manually input data for the next 10 years. However, the author chose to create this function to address the challenge.
Function Parameters:
- int year - a year
- int month - a month
- int day_o_w - the required day of the week (Monday=1, Tuesday=2, ..., Sunday=7)
- int sequence - the occurrence of the day of the week in the month (1 to 5). If the fifth day is requested and not present, the previous day (fourth) will be returned.
Example Usage in Code:
- Required: The second Friday in February 2026
- Code: [code snippet]
- Required: The last Thursday in December 2026
- Code: [code snippet]
The 'dayofweek.mq5' script is included, demonstrating this function by finding the date from the first example (second Friday in February 2026).
Input Parameters:
- [input parameters]
Result:
- [result]
The result can be verified using the Windows OS time bar.
You may also like: Weekends Check Function - excellent alternative for library users on MetaTrader 5.
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#property version "1.00"
#property script_show_inputs
#include <funcdayofweek.mqh>
input int year=1980;
input int month=2;
input int dayofweek=5;
input int sequence=2;
void onstart().......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.