calculation between non consecutives rows

Thanks for the reply fromlbendlin ,please allow me to provide another insight:

HI,FelipeScheihing 

Regarding the issue you raised, my solution is as follows:

1.First I have created the following table and the column names and data are the data you have given:

2.Create calculated column references:

predate =
VAR currentdate = 'kk'[date]
RETURN
    IF (
        'kk'[gap] = "gap",
        MAXX (
            FILTER (
                'kk',
                'kk'[gap] = "gap"
                    && 'kk'[date] < currentdate
                    && 'kk'[id] = EARLIER ( kk[id] )
            ),
            'kk'[date]
        ),
        BLANK ()
    )

diffhour = DATEDIFF('kk'[predate],'kk'[date].[Date],HOUR)

diffmonth = DATEDIFF('kk'[predate],'kk'[date].[Date],MONTH)

3.Here's my final result, which I hope meets your requirements.

4.Here is the relevant documentation:

DATEDIFF function (DAX) - DAX | Microsoft Learn

Can you share sample data and sample output in tabular format if I am misunderstanding? Or a sample pbix after removing sensitive data. We can better understand the problem and help you.

Please find the attached pbix relevant to the case.

Best Regards,

Leroy Lu

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