Master Calculating Business Days in Power Apps | Complete Step-by-Step Guide
In this hands-on Power Apps tutorial, you'll learn how to implement one of the most essential time-based calculations in business apps: calculating business days from a selected date. Whether you're tracking deadlines, service level agreements (SLAs), or project timelines, knowing how to exclude weekends and holidays is crucial for accuracy.
This video walks you through every step of the process—from designing the interface to implementing a user-defined function (UDF) that handles all the logic behind the scenes.
🔍 What You’ll Learn in This Video:
✅ How to select a start date in your app
✅ How to add or subtract business days, skipping weekends
✅ How to include holiday logic using a dedicated holiday list
✅ How to use the GetBusinessDay formula from PowerAppsTools.com
✅ How to enable and test user-defined functions in your app
✅ Tips for refreshing, troubleshooting, and visualizing results
📽️ Video Chapters
00:00 – Introduction and Overview
00:30 – Demonstration of Business Day Calculation
01:43 – Handling Holidays in Business Day Calculation
02:54 – Understanding the Formula Behind the Calculation
04:34 – Implementing the User-Defined Function
06:55 – Enabling and Testing the Function
08:18 – Conclusion and Next Steps
🛠️ Why Business Day Calculations Matter
Unlike simple calendar date math, business day calculations account for non-working days, making them ideal for:
Work order deadlines
Leave and vacation requests
Project scheduling
Customer response timelines
💡 About the Formula and Setup
The video features a user-defined function (UDF) called GetBusinessDay, which:
Accepts a starting date
Takes a number of business days to add or subtract
References a holiday list to exclude specific dates
Returns the correct resulting business date
This formula is available via PowerAppsTools.com and can be integrated directly into your app with just a few tweaks.
⚠️ Note: UDFs are currently experimental. You’ll need to enable them in your app settings under Advanced /Experimental Features.
🔗 Resources Mentioned in the Video:
📄 Business Days Formula: PowerAppsTools.com
🧪 Enable UDFs in Settings / Experimental Features
🎯 Consider using SharePoint, Excel, or Dataverse to store holiday dates
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