Share - calculate working days between two given dates

[Li]

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. 

[v-micsh-msft · Accepted solution]

Hi @Li,

Thanks for your sharing.

Regards,

Michael

[Medalow]

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

Cheers!

[lpr]

thanks for sharing but;

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

[mogulman]

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:

Description	HolidayDate
New Year's Day	1/1/2019
Birthday of Martin Luther King, Jr.	1/21/2019
Washington's Birthday	2/18/2019
Memorial Day	5/27/2019
Independence Day	7/4/2019
Labor Day	9/2/2019
Columbus Day	10/14/2019
Veterans Day	11/11/2019
Thanksgiving Day	11/28/2019
Christmas Day	12/25/2019
New Year's Day	1/1/2020

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.  

[Rob_CTL]

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.

• 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

[APD_Karl]

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

[mogulman]

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;
        }

[APD_Karl]

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)

[rwittels]

Thank you for this. How would one get hours difference?