DateAdd Function not displaying values for all rows

[Anonymous]

I have an interval column and a date column.  I used the DATEADD function to to add the intervals in months.  The formla works for some rows.  I have intervals for every row in my report.  My DAX formula is the InspectionDue column I added to my dataset.   Here is my DAX formula - 

InspectionDue = DATEADD(Table_owssvr__6[Last Inspection / Calibration Date],'Table_owssvr__6'[Inspection / Calibration Interval],MONTH)

 See exmple below

[v-kkf-msft · Accepted solution]

Hi @Anonymous ,

Please try the following formula:

InspectionDue = 
EDATE (
    MAX ( Table_owssvr__6[Last Inspection / Calibration Date] ),
    -1 * [Inspection / Calibration Interval]
)

If the problem is still not resolved, please provide detailed error information or the expected result you expect. Let me know immediately, looking forward to your reply.

Best Regards,
Winniz
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[HotChilli]

The classic problem with DATEADD is that the resulting dates have to be present in the column that you pass to the function. So, I would say that it is returning blanks for those rows.

Alternative solutions : use a date table (which contains all dates)

Add the month in power query.

construct the date results in DAX without using DATEADD.

--

There will be details on each of those if you search the forum / web.

Good luck