How to subtract times based on criteria of another column

[newtralise]

With the 'Time' category sorted from earliest to latest in my Table visualisation, I would like to find a way to subtract the corresponding times between the first Event Type ID = 13 and the last Event Type ID = 14. I would like to do this for both the Am and the Pm session. The times highlighted in yellow refer to the AM's session first 13 and last 14. The times corresponding to the blue circles refer to the PM's session first 13 and last 14. 

[v-chenwuz-msft · Accepted solution]

Hi @newtralise ,

Please try this expression to do that:

Measure =
VAR _a =
    FILTER ( ALL ( 'Table (2)' ), [Time] < TIME ( 12, 0, 0 ) )
VAR _p =
    FILTER ( ALL ( 'Table (2)' ), [Time] >= TIME ( 12, 0, 0 ) )
RETURN
    IF (
        MAX ( 'Table (2)'[Time] ) < TIME ( 12, 0, 0 ),
        CALCULATE ( MAX ( 'Table (2)'[Time] ) - MIN ( 'Table (2)'[Time] ), _a ),
        CALCULATE ( MAX ( 'Table (2)'[Time] ) - MIN ( 'Table (2)'[Time] ), _p )
    )

 Result:

Pbix in the end you can refer.

Best Regards

Community Support Team _ chenwu zhu

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

[lbendlin]

Please provide sanitized sample data that fully covers your issue. If you paste the data into a table in your post or use one of the file services it will be easier to assist you. Avoid posting screenshots of your source data if possible.

Please show the expected outcome based on the sample data you provided. Screenshots of the expected outcome are ok.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523