cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
jsquaredz Regular Visitor
Regular Visitor

Datediff start date cannot be greater than the end date

I have been using DAX DATEDIFF statement  to calculate No Days between two dates which are

Target Completion Date and Actual Completion Date

 

Which works all very well except now I have sometimes the Actual Completion Date is before the Target Completion Date (ie where an Action Officer performed better and completed the task before the "target" date).

 

However, of course, DATEDIFF doesn't like this and gives error "In DATEDIFF function, the start date cannot be greater than the end date"

 

Why can't this Dax function just return the negative value in this case?  Is there a way we can enhance this function to return a signed integer?

1 ACCEPTED SOLUTION

Accepted Solutions
Framet Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

Hi,

 

Whilst I can't answer the "why" it can't return a negative integer for dates where the start date is after the end date I can suggest you could simply handle it with a IF statement. Test your dates if the start date is greater than the end date then change the sign of the result datediff with the dates passed to the function the other way round.

DateDiffMeasure :=
IF (
    [StartDateField] > [EndDateField],
    0 - DATEDIFF ( [EndDateField], [StartDateField], DAY ),
    DATEDIFF ( [StartDateField], [EndDateField], DAY )
)

Might work for you?

View solution in original post

11 REPLIES 11
Framet Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

Hi,

 

Whilst I can't answer the "why" it can't return a negative integer for dates where the start date is after the end date I can suggest you could simply handle it with a IF statement. Test your dates if the start date is greater than the end date then change the sign of the result datediff with the dates passed to the function the other way round.

DateDiffMeasure :=
IF (
    [StartDateField] > [EndDateField],
    0 - DATEDIFF ( [EndDateField], [StartDateField], DAY ),
    DATEDIFF ( [StartDateField], [EndDateField], DAY )
)

Might work for you?

View solution in original post

jsquaredz Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

Thanks.  I realize there is a workaround we can wrap around the functions behaviour, but  I would like this built in Dax function so that it returns a signed integer.  Makes more sense to me that I just put in two dates and it returns the difference.

Framet Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

In that case I think your best course of action is to make a suggestion on the idea forum for the behaviour of the function be changed and see if other users in the community support it.

https://ideas.powerbi.com/forums/265200-power-bi-ideas

 

Many thanks

 

Thomas

jsquaredz Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

Looks like someone else has this same idea.  Please vote this up.  Much appreciated.

 

https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/16841479-date-diff-start-date-not...

 

 

Highlighted
heidibb Member
Member

Re: Datediff start date cannot be greater than the end date

I realize this is an older topic, but I came across it when searching for a similar solution. I wanted to share that this solution also worked for me:

 

Days Btwn = -1 * (format(start_date, "MM-DD-YYYY") - format(end_date, "MM-DD-YYYY")) 

 

I needed to add the format since our dates have timestamp and I wanted the difference in days regardless of the hour. If you are ok with getting portions of days, leave off the format!

 

Hope this  helps someone!

 

hmedinaa Frequent Visitor
Frequent Visitor

Re: Datediff start date cannot be greater than the end date

It works great

Thanks,

kdaya Regular Visitor
Regular Visitor

Re: Datediff start date cannot be greater than the end date

HI please can someone help 

 

I am trying to calculate the total amount of hours between Todays date and set date that i have in my table but i keep getting the same error

 

DUE BY TIME = DATEDIFF(request[DueBy Time].[Date], TODAY(),HOUR)

 

The due by time is usually greater than the current date

 

Thanks,

AldertNagel Visitor
Visitor

Re: Datediff start date cannot be greater than the end date

Makes totally sense what you suggest. Microsoft, Why not fix this properly or create a function what does work (to ensure existing reports do not change behaviour).

Catcheson Frequent Visitor
Frequent Visitor

Re: Datediff start date cannot be greater than the end date

I was using the Feb 2018 version of BI Desktop and the DATEDIFF worked perfectly and did return a negative answer.  However for reasons of incompatibility with the Report Server I had to revert to the June 2017 version and I now have this problem.

 

I’m not sure what version you are on and when the the feature started to work but upgrading might be a solution for you.

 

unfortunately for me, it’s still a pain in the neck as in fact is most of Power BI!  Never again will I use software that isn’t close to being finished and operational!  

 

Helpful resources

Announcements
October 2019 Community Highlights

October 2019 Community Highlights

October was a busy month in the community. Read the recap article to learn about some of the events and content.

New Badges

Incoming: New and Improved Badges

Exciting news: We've given our badges an overhaul and added brand news ones.

Ask Amir Anything

Exclusive LIVE Community Event No. 2 – Ask Amir Anything

Next in our Triple A series: Ask Amir Netz questions about the latest updates, features and future.

Analytics in Azure virtual event

Analytics in Azure virtual event

Experience a limitless analytics service built to ingest, prep, manage, and serve data for immediate use in Power BI.

Users Online
Currently online: 147 members 1,349 guests
Please welcome our newest community members: