Difference between rows by Name by date

[JCKong]

I can't figure out how to do this in dax column, getting the duration difference from the next row per name. 
The table is already sorted by Name then by shift date then by punch time in ascending order.

[JCKong]

Hi @tamerj1 ,

Encountered an issue when the time stamp passed the next day, example:

Shift Date: 11/10/2023 Punch Time 1:  11:00 PM
Shift Date: 11/11/2023 Punch Time 2: 12:30 AM

[tamerj1]

@JCKong 

Ctreate a Punch DateTime column by adding Date and Time then use the following 

Duration =
VAR CurrentTime = 'Table'[Punch Time]
VAR CurrentNameTable =
CALCULATETABLE (
VALUES ( 'Table'[Punch Time] ),
ALLEXCEPT ( 'Table', 'Table'[Name] )
)
VAR TableAfter =
FILTER ( CurrentNameTable, 'Table'[Punch DateTime] > CurrentTime )
VAR NextTime =
MINX ( TableAfter, 'Table'[Punch DateTime] )
RETURN
IF (
'Table'[Activity] = "Logout",
0,
COALESCE ( NextTime, CurrentTime ) - CurrentTime
)

[JCKong]

Currently I use this but some of the Names doesn't show their duration:

Duration = 
VAR NextRow =
CALCULATE (
SUM (Table[PunchTime]),
FILTER (Table, Table[Index] = EARLIER (Table[Index]) + 1)))
RETURN
IF(Table[Activity] = "Logout", 0 ,  NextRow - Table[PunchTime])

[tamerj1 · Accepted solution]

Hi @JCKong 

please try

Duration =
VAR CurrentTime = 'Table'[Punch Time]
VAR CurrentNameDateTable =
CALCULATETABLE (
VALUES ( 'Table'[Punch Time] ),
ALLEXCEPT ( 'Table', 'Table'[Name], 'Table'[Short Date] )
)
VAR TableAfter =
FILTER ( CurrentNameDateTable, 'Table'[Punch Time] > CurrentTime )
VAR NextTime =
MINX ( TableAfter, 'Table'[Punch Time] )
RETURN
COALESCE ( NextTime, CurrentTime ) - CurrentTime

[JCKong]

Thank you @tamerj1 , this did work without the index column which increases the file size.

[JCKong]

Used a measurement to Sum(Table[Duration]) as the Duration column above only shows earliest and there's no selection for SUM.