Convert negative decimal numbers to time (Long Time)

Dates and Times can only ever be positive. What does your column represent?

Rather than creating a DAX calculated column, consider keeping your column as a decimal, creating your measure and do the formatting at the end (assuming the result is >0, or you will still get an error). Please see this article.

Calculate and Format Durations in DAX – Hoosier BI

Pat

Hi Anonymous ，

You can refer the following links to get it:

Converting Decimal Time to Days, Hours, Minutes, Seconds in Power BI

decimal to duration conversion

NewColumn = 
TRUNC(Table4[Zeit2 - Copy]) & "." &  //Days
FORMAT(TRUNC(Table4[Zeit2 - Copy]*24);"00") & ":" &//Hours  
FORMAT(TRUNC(Table4[Zeit2 - Copy]*24*60);"00") &  ":" & //Minutes
FORMAT(Table4[Zeit2 - Copy]*24*60*60;"00.0000000") //Seconds

Converting “Seconds” to “Duration” in Power BI

If the above one can't help you get the desired result, please provide some sample data of the field "Gepland" and "Aantal" (exclude sensitive data) with Text format and your expected result with backend logic and special examples. It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards

Hi  Anonymous ,

Whether your problem has been resolved? If yes, could you please mark the helpful post as Answered? It will help the others in the community find the solution easily if they face the same problem as yours. Thank you.

Best Regards