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madalin's avatar
madalin
Regular Visitor
5 years ago
Solved

DAX formula for calculating diff date of consecutive rows

Hi, 

 

I'm new to DAX and I need your help.

 

I have the following table:

 

device_idtimedisplay_timeCalculate
AA9/10/2020 01:029/10/2020 01:0200:01:00
AA9/10/2020 13:059/10/2020 01:0500:03:34
AA9/10/2020 01:069/10/2020 01:0600:00:41
AA9/10/2020 13:099/10/2020 13:0912:03:34
BB9/11/2020 00:289/11/2020 00:28 00:01:00
BB9/11/2020 12:309/11/2020 12:3012:02:16
BB9/11/2020 00:329/11/2020 12:3200:02:37
BB9/11/2020 12:359/11/2020 12:3500:02:15
CC9/10/2020 09:599/10/2020 09:59 00:01:00
CC9/10/2020 22:019/10/2020 22:0112:01:30
CC9/10/2020 10:039/10/2020 22:0300:02:14
CC9/10/2020 22:059/10/2020 22:0500:02:07

 

 

I want to calculate de difference in seconds between two consecutive display times for a device( like in the Calculate column) and if it's possible for the first display_time for a device to insert a value e.g. 60 seconds.

 

I've tried adding first an index column and after that using the DATEDIFF formula but I can't properly sort the table and get right the consecutive values for display_time when I used an Index column.

 

 

Kind regards,

Madalin

 

 

 

Need Help
  • v-alq-msft's avatar
    v-alq-msft
    5 years ago

    Hi, madalin 

     

    Based on your description, I created data to reproduce your scenario. The pbix file is attached in the end.

    Table:

     

    You may create a measure as below.

    Seconds = 
var tab = 
ADDCOLUMNS(
    ALL('Table'),
    "Result",
    var _lastdatetime =
    CALCULATE(
        MAX('Table'[Display_Time]),
        FILTER(
            ALL('Table'),
            'Table'[Device_ID]=EARLIER('Table'[Device_ID])&&
            'Table'[Display_Time]<EARLIER('Table'[Display_Time])
        )
    )
    return
    IF(
        ISBLANK(_lastdatetime),
        60,
        DATEDIFF(_lastdatetime,[Display_Time],SECOND)
    )
)
return
SUMX(
    ADDCOLUMNS(
        'Table',
        "Re",
        SUMX(
            FILTER(
                tab,
                [Device_ID]=EARLIER('Table'[Device_ID])&&
                [Display_Time]=EARLIER('Table'[Display_Time])
            ),
            [Result]
        )
    ),
    [Re]
)

     

    Result:

     

    Best Regards

    Allan

     

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

     

2 Replies

  • AlB's avatar
    AlB
    Icon for Community Champion rankCommunity Champion
    5 years ago

    Hi madalin 

    Try this for your new column:

    New Column = 
VAR current_ = Table1[display_time]
VAR previous_ =
    CALCULATE (
        MAX ( Table1[display_time] ),
        Table1[display_time] < EARLIER ( Table1[display_time] ),
        ALLEXCEPT ( Table1, Table1[device_id] )
    )
RETURN
    IF ( ISBLANK ( previous_ ), 1 / 24, previous_ - current_ )

     This will give you the result in days (decimal number). You can change the type to time if you want to show it in the format you used in your example but take into account that that only will show up to 23:59:59

     

    Please mark the question solved when done and consider giving kudos if posts are helpful.

    Contact me privately for support with any larger-scale BI needs, tutoring, etc.

    Cheers 

     

     

     

  • v-alq-msft's avatar
    v-alq-msft
    Icon for Community Support rankCommunity Support
    5 years ago

    Hi, madalin 

     

    Based on your description, I created data to reproduce your scenario. The pbix file is attached in the end.

    Table:

     

    You may create a measure as below.

    Seconds = 
var tab = 
ADDCOLUMNS(
    ALL('Table'),
    "Result",
    var _lastdatetime =
    CALCULATE(
        MAX('Table'[Display_Time]),
        FILTER(
            ALL('Table'),
            'Table'[Device_ID]=EARLIER('Table'[Device_ID])&&
            'Table'[Display_Time]<EARLIER('Table'[Display_Time])
        )
    )
    return
    IF(
        ISBLANK(_lastdatetime),
        60,
        DATEDIFF(_lastdatetime,[Display_Time],SECOND)
    )
)
return
SUMX(
    ADDCOLUMNS(
        'Table',
        "Re",
        SUMX(
            FILTER(
                tab,
                [Device_ID]=EARLIER('Table'[Device_ID])&&
                [Display_Time]=EARLIER('Table'[Display_Time])
            ),
            [Result]
        )
    ),
    [Re]
)

     

    Result:

     

    Best Regards

    Allan

     

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