Date time difference in hours and minutes

[Sujit14496]

Hello All , 

My name is Sujit . I hope @amitchandak   or other experts can help me in this . Any help is greatly appreciated .

I have a column with Timestamp in them with format yyyy/mm/dd hh:mm . And i have almost 756 rows . There are one index for it which is not integer data type but string type because it does have some alphabet in between .here is an example of my index 1234A980 . 

Now following is how my data looks like ,

Datetime	Index
1/1/2020 12:45	2123A4
1/2/2020 1:32	2123A4
1/3/2020 4:00	2123A4
1/6/2020 5:00	2123A4
2/20/2020 3:00	48320B3249
2/21/2020 4:00	48320B3249
2/22/2020 4:00	48320B3249

What i want to do is depending on the index , i have to calculate time difference in hours and minutes . 
For example for index 21234A has 4 rows . hence for these 4 rows ill calculate the time difference as
first row  will show as 0 in a new column as timedifference 
second row will show value of  1/2/2020 1:32  -  1/1/2020 12:45
third row will show value of  1/3/2020 4:00   -  1/2/2020 1:32 

So every time a index changes for the first time (first date time stamp) time diff must be zero.

The time difference should be in reference with index


Please if any doubt do comment . Any help will be appreciated . 

I am trying with following DAX but its not working , its showing largest date based on index
please help

timediff = 

VAR a = 'Main Table'[Timestamp]

VAR b = 'Main Table'[Index]

var d = CALCULATE(MAXX('Main Table', 'Main Table'[Timestamp]),FILTER('Main Table','Main Table'[index]= EARLIER('Main Table'[index])))

return

Datediff(b,a,HOURS)

[tamerj1]

Hi @Sujit14496 
Another way of doing that (Including the HH:MM time format)

timediff =
VAR CurrentTime = 'Main Table'[Timestamp]
VAR CurrentIndexTable =
    CALCULATETABLE ( 'Main Table', ALLEXCEPT ( 'Main Table', 'Main Table'[Index] ) )
VAR TimesBefore =
    FILTER ( CurrentIndexTable, 'Main Table'[Timestamp] < CurrentTime )
VAR PreviousTime =
    MAXX ( TimesBefore, 'Main Table'[Timestamp] )
VAR TimeDiff =
    DATEDIFF ( PreviousTime, CurrentTime, MINUTE )
RETURN
    IF (
        NOT ISBLANK ( PreviousTime ),
        QUOTIENT ( TimeDiff, 24 ) & ":"
            & MOD ( TimeDiff, 24 )
    )

[Sujit14496 · Accepted solution]

@Vera_33  Hello i finally cracked it with your starting help . thanks .

I used MAXX instead of MINX what you used and i also made a column with RANKX and used it in the filter as current RANK > EARLIER (RANK) Thankyou so much. For my other friends out there following is what i used .

Timediff =

VAR CurTime = 'Main Table'[Timestamp]

VAR CurIndex = 'Main Table'[ind]

VAR CurRank = 'Main Table'[Rank]

VAR PrvTime = MAXX(FILTER( 'Main Table','Main Table'[ind] = EARLIER('Main Table'[ind]) && 'Main Table'[Rank] < EARLIER('Main Table'[Rank])

),'Main Table'[Timestamp])

return

IF(ISBLANK(PrvTime),0,(DATEDIFF(PrvTime,CurTime,MINUTE)))

[Sujit14496]

@MFelix 

[Sujit14496]

@KT_Bsmart2gethe @Vera_33 @Ashish_Mathur @Greg_Deckler @tamerj1 @SpartaBI @GuyInACube @PBICommunity 

[Vera_33]

Hi @Sujit14496 

I assume you are adding a DAX Calculated column, see if it is what you are looking for

timediff = 
VAR CurTime = 'Table'[Datetime]
VAR CurIndex = 'Table'[Index]
var NextTime = MINX(FILTER('Table','Table'[index]= CurIndex&&'Table'[Datetime]>CurTime), 'Table'[Datetime])
return
Datediff(CurTime,NextTime,HOUR)

[Sujit14496]

hello @Vera_33  ,
Thankyou for your reply . but it is not working properly for me .

I would love to also explain one more thing ,
Following is output i am looking for ,

Col A                                        Index                                                 Timediff

1/1/2020 12:45	2123A4	0
1/2/2020 1:32	2123A4	A2-A1
1/3/2020 4:00	2123A4	A3-A2
1/6/2020 5:00	2123A4	A4-A3
2/20/2020 3:00	48320B3249	0
2/21/2020 4:00	48320B3249	A6-A5
2/22/2020 4:00	48320B3249	A7-A6

[Sujit14496]

 @tamerj1Please help