Why recreate the wheel? Automating date functions in Power BI with Extended Date Table (Power Query M function)


In the world of Power BI, automation is key to efficiency and accuracy. Why reinvent the wheel when almost all the date functions you need have already been created? One crucial aspect of data management is the creation and management of date tables. These tables provide essential context for time-based analyses and reporting. In this blog post, we’ll delve into how the Extended Date Table Power Query M function can revolutionize the way you handle date-related tasks in Power BI, offering complete automation and flexibility.

Understanding the Extended Date Table Power Query M Function:

The Extended Date Table Power Query M function is a powerful tool that allows users to generate comprehensive date tables within Power BI. Developed by Melissa de Korte, an Enterprise DNA Expert, this function streamlines the process of creating date tables, offering a wide range of functionalities and customization options.

In the six-minute video below Melissa de Korte from Enterprise DNA details how to add the Power Query M function into a Power BI Report. Here is a link where you can find the code to copy and use yourself

Key Features and Benefits:

  1. Dynamic Date Range: With the Extended Date Table function, users can define a dynamic date range based on their specific requirements. Whether it’s a fiscal year, a custom calendar, or a rolling window, this function adapts to various scenarios effortlessly.
  2. Automated Column Generation: The function generates a plethora of date-related columns, including year, quarter, month, week, day, and more. These columns provide granular insights into temporal data, facilitating sophisticated analyses and visualizations.
  3. Holiday and Working Day Integration: Users can incorporate lists of holidays and define working day parameters within the function. This ensures accurate calculation of business days and enables precise date-based calculations in Power BI reports.
  4. Simplified Implementation: By simply copying and pasting the M code provided by the function, users can integrate the Extended Date Table seamlessly into their Power BI projects. This eliminates the need for manual data entry and reduces the risk of errors.
  5. Continuous Updates and Support: Melissa de Korte and the Enterprise DNA Power BI community regularly update and enhance the Extended Date Table function. Users can stay abreast of the latest developments and leverage new features as they become available.

Case Study: Automating Reporting with Extended Date Table Function

To illustrate the practical application of the Extended Date Table function, consider a scenario where a nonprofit needs to analyze performance over multiple fiscal years. By implementing this function, the organization can automate the generation of a comprehensive date table tailored to its fiscal calendar. This enables stakeholders to track trends, monitor seasonality, and make data-driven decisions with ease.


The Extended Date Table Power Query M function empowers Power BI users to streamline date-related workflows and unlock the full potential of their data. By embracing automation and leveraging advanced functionalities, organizations can elevate their analytics capabilities and drive business growth. Incorporate the Extended Date Table function into your Power BI arsenal and witness the transformation in your data management practices.

Do you have a reporting tip you would like to share? Let me know as I am gathering samples for an upcoming user group or roundtable discussion.

Jim Evans is the ActiveEcho Product Ambassador at MissionBI.com. ActiveEcho delivers a continually refreshing Azure SQL copy of Blackbaud’s Raiser’s Edge NXT and/or Financial Edge NXT databases, specifically designed to connect with the latest reporting tools and AI interfaces.

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