Difference between two dates

[gunasai]

Hi guys,

I have 2 tables as follows,

Order table

Order Number	Order Date
1111	1/1/2020
2222	1/5/2020
3333	1/10/2020
4444	1/20/2020

Invoice table

Order Number	Invoice_date	Shipment_num
1111	1/30/2020	1
1111	2/5/2020	2
2222	1/20/2020	1
2222	1/25/2020	2

Both these tables have a 1-many relationship as you can see above.

How do I create a measure to find the difference between the dates (Invoice Date - Order Date) to find the number of days? I want it for shipment_num = 1 only.

I tried,

Order Completion Time in days = DATEDIFF(Min('Order Table'[Order Date]), Max('Invoice Table'[Invoice Date]), DAY)

and then filtered shipment_num = 1 in the visual table.

I am not able to aggregate to find the average no. of days. I am not able to summarize it after the calculation.

Any help would be appreciated.

Thanks!

[ebeery · Accepted solution]

@gunasai  are you attempting to do this in a measure or a calculated column?

One way to do it would be with a calculated column, added to the invoice table.  Formula might look something like:

Order Completion Time in Days = 

VAR _Invoice_Date = 'Invoice Table'[Invoice_date]
VAR _Order_Date = LOOKUPVALUE('Order Table'[Order Date],'Order Table'[Order Number],'Invoice Table'[Order Number])
VAR _Result = DATEDIFF(_Order_Date, _Invoice_Date, DAY)

Return
_Result

[ebeery · Accepted solution]

@gunasai  are you attempting to do this in a measure or a calculated column?

One way to do it would be with a calculated column, added to the invoice table.  Formula might look something like:

Order Completion Time in Days = 

VAR _Invoice_Date = 'Invoice Table'[Invoice_date]
VAR _Order_Date = LOOKUPVALUE('Order Table'[Order Date],'Order Table'[Order Number],'Invoice Table'[Order Number])
VAR _Result = DATEDIFF(_Order_Date, _Invoice_Date, DAY)

Return
_Result

[gunasai]

THIS WORKED!!!
Thank you so much!

I never did a calculated column before when there are two tables. Thank you so much for this again!

Just out of curiosity to learn, how would I do the same if I wanted to do a measure?

[ryan_mayu]

@gunasai 

you can also try this

Measure = DATEDIFF(max('Order'[Order Date]),MAXX(FILTER(Invoice,Invoice[Shipment_num]=1),'Invoice'[Invoice_date]),DAY)

pls see the attachment below

[gunasai]

Thank you!

[ebeery · Accepted solution]

@gunasai a similar approach could be used with a measure in a table visual, but in order for it to work properly you would need to ensure that only a single "Invoice_Date" and "Order Number" are in "context" (in other words, you need to include Order Number and Invoice Date in your visual). 

I would also use SELECTEDVALUE() to ensure the measure doesn't return anything if there are more than one Order Number and Invoice Date in context.

Order Completion Time in Days (measure) =
VAR _Invoice_Date =
    SELECTEDVALUE ( 'Invoice Table'[Invoice_date] )
VAR _Order_Date =
    LOOKUPVALUE (
        'Order Table'[Order Date],
        'Order Table'[Order Number], SELECTEDVALUE ( 'Invoice Table'[Order Number] )
    )
VAR _Result =
    DATEDIFF ( _Order_Date, _Invoice_Date, DAY )
RETURN
    _Result

[gunasai]

Perfect!
Thank you!