Going back only workdays

[Anonymous]

Hello,

trying to build a funciton that i can give a date and a number of days and it go back this number of days but only counting during week.

For example, if i give 15/01/2020 and 15 it gives me the date 25/12/2019.

Thank you,

[Jimmy801 · Accepted solution]

Hello @Anonymous 

I've created for you this custom function that does this calculation. It has 3 parameters...

Startdate, number to be added (or in case -15 subtracted). As optional parameter a list of holidays could be inputet

// AddDayWithOutWeekendsAndHolidays
(DateStart as date, DayDifference as number, optional Holidays as list) =>
let
    HolidayIntern = if Holidays = null then List.Buffer({}) else List.Buffer(Holidays),
    CountDirection = if DayDifference<0 then -1 else 1,
    CreateListDate = List.Generate
    (
        ()=> [
            Dateint=DateStart,
            DateDifferenceCount = 0
        ],
        each if CountDirection= -1 then [DateDifferenceCount] >= DayDifference else  [DateDifferenceCount] <= DayDifference,
        (prevrecord)=> [
            Dateint=Date.AddDays(prevrecord[Dateint], (1*CountDirection)),
            DateDifferenceCount = if 
                List.Contains(HolidayIntern,Date.AddDays(prevrecord[Dateint],(1*CountDirection))) or
                Date.DayOfWeek(Date.AddDays(prevrecord[Dateint], (1*CountDirection)))>4 
                then  
                    prevrecord[DateDifferenceCount]
                    else (prevrecord[DateDifferenceCount]+(1*CountDirection))
        ],
        each [Dateint]
    ),
    FinalResult = if DayDifference = 0 then DateStart else if CountDirection= -1 then List.Min(CreateListDate) else List.Max(CreateListDate)    
    
     
in
    FinalResult

Copy paste this code to the advanced editor and try to invoke the function.

If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)
Kudoes are nice too

Have fun

Jimmy