The function calculates the number of workdays between two dates in Excel. When using the function, the number of weekends is automatically excluded. It also allows you omegle to skip specified holidays and only count business days. It is categorized in Excel as a Date/Time Function. You can use this formula to calculate working days in Excel between two dates.
I'm posting my solution for this common issue here in the hopes to help other users who have similar requirements to assign Flexi-tasks to users on Business Days only. I had seen on nintex community that there was a UDA created for this but it didn't work properly for me (due dates were just blank). I am using SharePoint 2013.
Here is my manual workaround that has been working very well for my workflow: