Get date delta between 2 rows

[alexmoller96]

I am reading data from a flat log file, which shows the date and time that a device was connected / disconnected. The connect and disconnect entries are on 2 different rows. I want to work out the time difference between connect / disconnect so I can work out the usage time 

Eventually there will be more than one device IP and different connects / disconnects in the list so we need to make sure that is taken into account.

Is that something that is possible in PowerBI? 

Here is what the data looks like:

Many Thanks in Advance,

Alex.

[rubayatyasmin]

Hi, @alexmoller96 

try using date diff and minx

example code

Usage Time = SUMX(
FILTER(
'YourTable',
'YourTable'[Event] = "Disconnect"
),
DATEDIFF(
MINX(
FILTER(
'YourTable',
'YourTable'[Event] = "Connect" &&
'YourTable'[DeviceIP] = EARLIER('YourTable'[DeviceIP]) &&
'YourTable'[DateTime] < EARLIER('YourTable'[DateTime])
),
'YourTable'[DateTime]
),
'YourTable'[DateTime],
MINUTE
)
)

also this thread should be helpful

Solved: Re: Show text for date range between 45 days and 5... - Microsoft Fabric Community

[alexmoller96]

Hi @rubayatyasmin, thanks a lot for your reply. I tried using the code that you supplied but dont get any values, am I missing something? 

[rubayatyasmin · Accepted solution]

the issue could be with earlier. let's try without earlier. 

before trying this, make sure Ensure that the 'DateTime' column in your data is indeed of DateTime data type. If it is a string, the DATEDIFF function might not work as expected.

Verify that for each "Connect" event, there is a corresponding "Disconnect" event. If not, the calculation would not have a disconnect time to subtract from, and this may result in blank values.

lastly, check for case sensitivity. write exactly what is stored in your column. 

// Add an index column to 'YourTable' using Power Query
// You should add this column before loading the data into Power BI
Index = Table.AddIndexColumn('YourTable', "Index", 1, 1)

// DAX measure
Usage Time =
SUMX(
FILTER(
'YourTable',
'YourTable'[Event] = "Disconnect"
),
VAR CurrentIndex = 'YourTable'[Index]
VAR CurrentDevice = 'YourTable'[DeviceIP]
VAR ConnectTime =
CALCULATE(
MAX('YourTable'[DateTime]),
FILTER(
'YourTable',
'YourTable'[Event] = "Connect" &&
'YourTable'[DeviceIP] = CurrentDevice &&
'YourTable'[Index] < CurrentIndex
)
)
RETURN
DATEDIFF(
ConnectTime,
'YourTable'[DateTime],
MINUTE
)
)

[alexmoller96]

Great - okay so now I get a value, but they all have the value of 1 - is this a formatting issue?

[alexmoller96]

Okay - I think I understand after looking at DATEDIFF - If I use SECOND instead of MINUTE, it gives me the number of seconds that the device was in use for - thanks a lot!!!!

@rubayatyasmin subsequent question - is there a way that I can filter this by date so I can get a value for usage time by day

[rubayatyasmin]

Good to know that it worked. 

would appreciate it if you accept it as a solution. 

And allow me some time I will get back to you with your subsequent question. 

and to add filter 

Usage Time by Day =
CALCULATE(
[Usage Time],
FILTER(
ALL('YourTable'),
'YourTable'[Date] >= MIN('YourTable'[Date]) &&
'YourTable'[Date] <= MAX('YourTable'[Date])
)
)