Selecting a date every x week

[ThomasWeppler]

Hi Power BI community

I have a table with five columns

1. Index: An index column

2. Assignment: A Number column that shows diffrent assignment. (In this example we will just look at [Assignment] = 1)

3. Date: A date colum that shows each date from today and the next three years

4. Firstdate: A date colum that shows which day an assingment started. (So in this example where we just look at one assingnment we will have the same date in each row)
5. Interval: A text colum that shows how often an assingment should be done. (It could be "7weeks" or "12weeks" or "26weeks" or anyother number between 1 and 52 followed by weeks.

I want to add a new column that shows 1 if the [Date] is equal to the [Firstdate] and if the [Date] is equal to [Firstdate] + a number of weeks equal to the periode in the Interval column. 

I really hope someone can give me a hit on what my next step should be. All help is greatly appreciated.

[slorin · Accepted solution]

Hi,

if 
  Duration.Days([Date] - [FirstDate]) = 0 
or
  Duration.Days([Date] - [FirstDate])/7 = [Interval]
then
 1
else
 null

Stéphane

[ThomasWeppler]

I have split the Interval column up and made gotten the first one or two digits in a column by themself, so the problem I have is to create the interval.