cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
VilleMasa
New Member

First date of last month in a logical comparison

I am using this expression in filter part of calculate function:

 

D_Employee[RowActiveFrom] < FIRSTDATE(PREVIOUSMONTH('Calendar'[date]))


However Power BI doesn't calculate it and gives this error:


"A function 'FIRSTDATE' has been used in a True/False expression that is used as a table filter expression. This is not allowed."

I'm just trying to compare the first date with another date and don't understand what is wrong here. Is there something to be corrected or a workaround to be used?

1 ACCEPTED SOLUTION
amitchandak
Super User
Super User

@VilleMasa , for the first date of last month

eomonth('Calendar'[date],-2)+1

 

In case of measure you might have to use

eomonth(max('Calendar'[date]) ,-2)+1

 



Learn Power BI - Full Course with Dec-2022, with new DAX functions like Window, Index, Offset !!
Did I answer your question? Mark my post as a solution! Appreciate your Kudos !! Proud to be a Super User! !!
Formatted Profit and Loss Statement with empty lines

View solution in original post

1 REPLY 1
amitchandak
Super User
Super User

@VilleMasa , for the first date of last month

eomonth('Calendar'[date],-2)+1

 

In case of measure you might have to use

eomonth(max('Calendar'[date]) ,-2)+1

 



Learn Power BI - Full Course with Dec-2022, with new DAX functions like Window, Index, Offset !!
Did I answer your question? Mark my post as a solution! Appreciate your Kudos !! Proud to be a Super User! !!
Formatted Profit and Loss Statement with empty lines

Helpful resources

Announcements
Carousel_PBI_Wave1

2023 Release Wave 1 Plans

Power BI release plans for 2023 release wave 1 describes all new features releasing from April 2023 through September 2023.

Power BI Summit Carousel 2

Global Power BI Training

Make sure you register today for the Power BI Summit 2023. Don't miss all of the great sessions and speakers!

Thank you 2022 Review

2022 Monthly Feature Releases

We had a great 2022 with a ton of feature releases to help you drive a data culture.

Top Solution Authors
Top Kudoed Authors