Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Enhance your career with this limited time 50% discount on Fabric and Power BI exams. Ends August 31st. Request your voucher.

Reply
tunneling
New Member

Daily data to bi-weekly with a "seed" date

We produce reporting on a bi-weekly basis based on a reporting calendar. I am trying to generate a calculated column to represent the Period Ending Date. Our weeks end on a Sunday and our data is seperated to daily when it's brought into Power BI.

 

Using a "seed" date of 08/02/2020 (which aligns with our calendar), I have successfully created this Period Ending Date field using the following in SQL:

 

dateadd(day, ceiling(datediff(day,'8/2/2020', daily_date) / 14.0) * 14, '8/2/2020') As period_end_date, 

 

 

However, when I try a simliar function to create a New Column in Power BI, the results are either blank or just wrong:

 

Period Ending Date = DATEADD('pcwb budget daily'[08022020], (CEILING(DATEDIFF(DATE(2020,8,2),'pcwb budget daily'[daily_date],DAY) / 14,1) * 14),DAY)

 

 

NOTE: Since the Dax DATEADD will not allow a constant as the first parameter, I created a column to hold the "seed" date. That column is named 'pcwb budget daily'[08022020]. For all rows, it's value is 8/2/2020.

 

I don't know if I'm dealing with a data type issue or if I'm just misunderstanding the Dax functions (e.g. expecting them to work like SQL's).

1 ACCEPTED SOLUTION

Your response at least got me in the right direction. Here is the solution:

 

Period Ending Date = 'pcwb budget daily'[daily_date]  + mod(datediff('pcwb budget daily'[daily_date],DATE(2020,8,2),DAY), 14)

View solution in original post

2 REPLIES 2
amitchandak
Super User
Super User

@tunneling , Try a new column like

 

'pcwb budget daily'[daily_date] + mod(datediff(DATE(2020,8,2), 'pcwb budget daily'[daily_date],DAY),14) *14

 

or


'pcwb budget daily'[daily_date] + (mod(datediff(DATE(2020,8,2), 'pcwb budget daily'[daily_date],DAY),14)+1) *14

Share with Power BI Enthusiasts: Full Power BI Video (20 Hours) YouTube
Microsoft Fabric Series 60+ Videos YouTube
Microsoft Fabric Hindi End to End YouTube

Your response at least got me in the right direction. Here is the solution:

 

Period Ending Date = 'pcwb budget daily'[daily_date]  + mod(datediff('pcwb budget daily'[daily_date],DATE(2020,8,2),DAY), 14)

Helpful resources

Announcements
July PBI25 Carousel

Power BI Monthly Update - July 2025

Check out the July 2025 Power BI update to learn about new features.

Join our Fabric User Panel

Join our Fabric User Panel

This is your chance to engage directly with the engineering team behind Fabric and Power BI. Share your experiences and shape the future.

June 2025 community update carousel

Fabric Community Update - June 2025

Find out what's new and trending in the Fabric community.