For an Item in my list I have three columns, "date started", "date completed", and "# of business days to complete"

Is there a way to build a flow so that when "date completed" is modified it calculates the number of business days between the two dates (including holidays) and auto fills the "# of business days to complete" column?

I have a list that stores the holidays for reference.

1 Answer 1


According to your needs, I suggest that you can create a Calculated column to achieve your needs.

Please follow the steps:

1.Go to the list, click List settings

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2.On the List Settings page, under the Columns section, click "Create column" to create a Calculated column named [# of business days to complete]

enter image description here

3.Please use the below the Formula:

=IF(ISBLANK([Date Completed]),"",([Date Completed]-[Date Started]))

enter image description here

4.Here is my test:

enter image description here

  • thank you, I have tried this and this doesnt take into account holidays though. From my understanding the only way I can do that is using flow and referring to my other holiday list somehow.
    – FatZack
    Commented Dec 14, 2021 at 14:10
  • Hi FatZack. According to my understanding, you want to calculate the number of working days between [Date Started] and [Date Completed], and you want to exclude holidays. Can you upload screenshots of the Holiday list? This will help us solve the problem better. Commented Dec 15, 2021 at 9:57
  • just uploaded it.
    – FatZack
    Commented Dec 15, 2021 at 17:40
  • Hi FatZack. Sorry, I still can’t see any information you uploaded here (including screenshots) Commented Dec 20, 2021 at 6:17
  • for some reason it was deleted by admin, but it is a simple list with two columns. One is the Holiday date and one is the Holidays name.
    – FatZack
    Commented Dec 20, 2021 at 15:13

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