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Frequent Visitor

Share - calculate working days between two given dates

Hello, I was trying to find the method to return the number of working days between two given dates and found the following article

 

https://powerapps.microsoft.com/en-us/blog/excluding-weekends-and-holidays-in-date-differences-in-po...

 

However, as the author mentioned "Notice that the partial week calculation given above will not work if the start or end dates fall on weekends"

 

So I spent some time writing the following formula which seems work for weekends too:

 

If(IsNewRequestFormValid, RoundDown(DateDiff(DatePickerFrom.SelectedDate, DatePickerTo.SelectedDate, Days) / 7, 0) * 5 +
If(Weekday(DatePickerTo.SelectedDate) >= Weekday(DatePickerFrom.SelectedDate),
If(Weekday(DatePickerTo.SelectedDate) = Weekday(DatePickerFrom.SelectedDate) && (Weekday(DatePickerTo.SelectedDate) = 1 || Weekday(DatePickerTo.SelectedDate) = 7),
0,
If(RoundDown((Weekday(DatePickerTo.SelectedDate) - Weekday(DatePickerFrom.SelectedDate))/5,0) >= 1,
5,
If(Weekday(DatePickerTo.SelectedDate) = 7,
Weekday(DatePickerTo.SelectedDate) - Weekday(DatePickerFrom.SelectedDate),
If(Weekday(DatePickerFrom.SelectedDate) = 1,
Weekday(DatePickerTo.SelectedDate) - Weekday(DatePickerFrom.SelectedDate),
Mod(Weekday(DatePickerTo.SelectedDate) - Weekday(DatePickerFrom.SelectedDate), 5) + 1)))),
(7 - Weekday(DatePickerFrom.SelectedDate) + Weekday(DatePickerTo.SelectedDate) - 1)))

 

I am sure it can be improved, so please feel free to make any enhancement. 

 

 

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
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Community Support
Community Support

Re: Share - calculate working days between two given dates

Hi @Li,

 

Thanks for your sharing.

 

Regards,

Michael

Community Support Team _ Michael Shao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

View solution in original post

8 REPLIES 8
Highlighted
Community Support
Community Support

Re: Share - calculate working days between two given dates

Hi @Li,

 

Thanks for your sharing.

 

Regards,

Michael

Community Support Team _ Michael Shao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

View solution in original post

Highlighted
Frequent Visitor

Re: Share - calculate working days between two given dates

@Li, thank you so much for sharing this! You are a life-saver 🙂 

Cheers!

Highlighted
Helper I
Helper I

Re: Share - calculate working days between two given dates

thanks for sharing but;

  1. What is IsNewRequestFormValid? is it a custom variable just for your case?
Highlighted
Skilled Sharer
Skilled Sharer

Re: Share - calculate working days between two given dates

I don't know what you mean by working day but my requirement excluded bank holidays so Christmas Day, New Years day don't count as working days.  Here is list:

 

DescriptionHolidayDate
New Year's Day1/1/2019
Birthday of Martin Luther King, Jr.1/21/2019
Washington's Birthday2/18/2019
Memorial Day5/27/2019
Independence Day7/4/2019
Labor Day9/2/2019
Columbus Day10/14/2019
Veterans Day11/11/2019
Thanksgiving Day11/28/2019
Christmas Day12/25/2019
New Year's Day1/1/2020

 

I also need to add/subtract working days from a date.  For example something is due in 10 business days (BD) or send a reminder notice 3 BD prior to due date.  The date could be a non workday.  I found using PA to do this was impossible.  I ended up doing an Azure Function.  

Highlighted
Helper IV
Helper IV

Re: Share - calculate working days between two given dates

Just to add a bit to this great thread, if you want to exclude public holidays/company days etc you just need to do the following (assuming SharePoint is the data source)

 

  • Create a new custom list with a couple of columns (Holiday Type, Date).  I made the Holiday column a choice one but that is up to you as this is purely used for reference by the person entering the dates.

 

pa-splist.png

 

  • Add this list as a data source in your app
  • Add the following code to the end of the code provided by @Li   (note the minus sign before CountIf)

 

- CountIf('Company & Public Holidays',Date >= DatePickerFrom, Date <= DatePickerTo)

 

  • Now the formula will remove and days from the total that are on the new list and fall between the to/from dates selected.

 

Rob

 

 

 

Highlighted
Frequent Visitor

Re: Share - calculate working days between two given dates

Thank @Rob_CTL and @Li - This has all been very helpful, but I have one problem. My company has 6 different regions with different public holidays.

 

For Public Holidays I have a single SharePoint List WIth 12 Columns, "Region 1 Holiday Name"; "Region 1 Holiday Date"; etc.

 

Another SharePoint List contains the "Staff Name", the "Region" they work in and other details.

 

How can I add to this formula - CountIf('Company & Public Holidays',Date >=DatePickerFrom, Date <=DatePickerTo) to determine from the inputted staff name, what region they are in and select the corresponding holiday dates column?

 

Thanks

Highlighted
Skilled Sharer
Skilled Sharer

Re: Share - calculate working days between two given dates

I doubt this will help you but I had a lot of complicated date calculations.  I have a table that lists the bank holidays.  I was using SQL Server.  I ended up writing and Azure Function in C#.  It calculates the due date for some task and sends out an email.  I am very pro Azure Functions.  They are a great compliment to PowerApps and keep the app very simple while adding complex functionality.

 

 

        public static DateTime CalcDate(DateTime date, string dueDateOffset, Dictionary<DateTime, int> hd)
        {
            int dCnt = 0;
            DateTime calcDate = new DateTime(1900, 1, 1);
            string[] parts = dueDateOffset.Split('|');
            if (parts[0] == "CD")
            {
                if (Int32.TryParse(parts[1], out dCnt))
                {
                    calcDate = date.AddDays(dCnt);
                }
                else
                {
                    calcDate = date;
                }
            }
            if (parts[0] == "BD")
            {
                int idx = 0;
                if (Int32.TryParse(parts[1], out dCnt))
                {
                    if (dCnt < 0)
                    {
                        idx = -1;
                    }
                    else
                    {
                        idx = 1;
                    }
                    dCnt = Math.Abs(dCnt);
                    while (dCnt > 0)
                    {
                        date = date.AddDays(idx);
                        if (!(date.DayOfWeek == System.DayOfWeek.Saturday || date.DayOfWeek == System.DayOfWeek.Sunday || hd.ContainsKey(date)))
                        {
                            dCnt--;
                        }
                    }
                    calcDate = date;
                }
                else
                {
                    calcDate = date;
                }
            }
            if (parts[0] == "DD")  //Due Date: DD|1 is 1st of next month, DD|2 is 1st 2 months from now.
            {
                if (Int32.TryParse(parts[1], out dCnt))
                {
                    date = date.AddMonths(dCnt);
                    date = new DateTime(date.Year, date.Month, 1);
                    calcDate = date;
                }
            }
            if (parts[0] == "G15")  //Grace 15: G15 is 15th of next month.
            {
                date = date.AddMonths(1);
                date = new DateTime(date.Year, date.Month, 15);
                calcDate = date;
            }
            if (parts[0] == "G30")  //Grace 30: G30 is last day of next month.
            {
                date = date.AddMonths(2);
                date = new DateTime(date.Year, date.Month, 1);
                date = date.AddDays(-1);
                calcDate = date;
            }
            if (parts[0] == "YD")
            {
                if (Int32.TryParse(parts[1], out dCnt))
                {
                    date = date.AddYears(dCnt);
                    calcDate = date;
                }
            }

            return calcDate;
        }

 

Highlighted
Frequent Visitor

Re: Share - calculate working days between two given dates

Thank you. I will try and break this down but it's clear I am out of my depth here.

 

This is what I have so far, and without the countif statement at the end, it works to eliminate the weekends from between the dates chosen.

 

RoundDown(DateDiff('Leave Start Date_DatePicker'.SelectedDate, 'Leave End Date_DatePicker'.SelectedDate, Days) / 7, 0) * 5 +
If(Weekday('Leave End Date_DatePicker'.SelectedDate) >= Weekday('Leave Start Date_DatePicker'.SelectedDate),
If(Weekday('Leave End Date_DatePicker'.SelectedDate) = Weekday('Leave Start Date_DatePicker'.SelectedDate) && (Weekday('Leave End Date_DatePicker'.SelectedDate) = 1 || Weekday('Leave End Date_DatePicker'.SelectedDate) = 7),
0,
If(RoundDown((Weekday('Leave End Date_DatePicker'.SelectedDate) - Weekday('Leave Start Date_DatePicker'.SelectedDate))/5,0) >= 1,
5,
If(Weekday('Leave End Date_DatePicker'.SelectedDate) = 7,
Weekday('Leave End Date_DatePicker'.SelectedDate) - Weekday('Leave Start Date_DatePicker'.SelectedDate),
If(Weekday('Leave Start Date_DatePicker'.SelectedDate) = 1,
Weekday('Leave End Date_DatePicker'.SelectedDate) - Weekday('Leave Start Date_DatePicker'.SelectedDate),
Mod(Weekday('Leave End Date_DatePicker'.SelectedDate) - Weekday('Leave Start Date_DatePicker'.SelectedDate), 5) + 1)))),
(7 - Weekday('Leave Start Date_DatePicker'.SelectedDate) + Weekday('Leave End Date_DatePicker'.SelectedDate) - 1)) - CountIf('Public Holidays', NSW >= 'Leave Start Date_DatePicker'.SelectedDate, NSW <= 'Leave End Date_DatePicker'.SelectedDate)

 

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