Calculate time between 2 dates in different rows

[pmeyp]

Hi guys, I need help with this:

given the following set of data, calculate time between the 2 dates in different rows. (Please note that I am converting time and date into number format for dates and times, this way it is easier to calculate date with time accurately, however if this is the wrong approach let me know). Thank you!

EVENT	EVENT FROM DATE&TIME	EVENT TO DATE&TIME
(1) A	44256.3333333333	44265.66768845
(2) B	44267.9546523445	44268.000000000
(3) C	44280.6546512324	44500.654852256

The objective would be to calculate longest time between events, for example:

Event A happened from 44256.3... until 44265.6..., therefore, uneventful time was from 44265.6... until Event B at 44267.9...

Anyone has any ideas on how best to approach this? (first event would theoretically return an error but that's fine).

[v-jayw-msft · Accepted solution]

Hi @pmeyp ,

Create an index column and use the following formula.

Column = 
var last_event = CALCULATE(MAX('Table'[EVENT FROM DATE&TIME]),FILTER('Table','Table'[Index]=EARLIER('Table'[Index])-1))
return
IF(ISBLANK(last_event),BLANK(),'Table'[EVENT FROM DATE&TIME]-last_event)

In addition, you could use DATEDIFF() function so that you don't have to convert time value to number value.

https://docs.microsoft.com/en-us/dax/datediff-function-dax 

Best Regards,

Jay

[selimovd]

Hello @pmeyp ,

add a new calculated column and calculate the difference:

Difference = myTable[EVENT TO DATE&TIME] - myTable[EVENT FROM DATE&TIME]

Then you can search or filter for the MAX and you should have the row with the longest duration.

If you need any help please let me know.
If I answered your question I would be happy if you could mark my post as a solution ✔️ and give it a thumbs up 👍

Best regards
Denis

Blog: WhatTheFact.bi

[pmeyp]

Hey @selimovd ,

This is not what I am looking for -- I want to calculate FROM time in Event B minus TO time in Event A (as this calculation yields the time in between events, not duration of event).

Any other ideas? 🤔